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<!-- DFIN New ActiveDisclosure (SM) XBRL Linkbase Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-02-28T07:26:57.5243+00:00 -->
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    <link:loc xlink:type="locator" xlink:href="beam-20221231.xsd#beam_OtherOperatingIncomeExpenseAbstract" xlink:label="beam_OtherOperatingIncomeExpenseAbstract"/>
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    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock" xlink:label="us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock"/>
    <link:loc xlink:type="locator" xlink:href="beam-20221231.xsd#beam_SuccessPaymentLiabilitiesMember" xlink:label="beam_SuccessPaymentLiabilitiesMember"/>
    <link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2022/elts/us-gaap-2022.xsd#us-gaap_IncreaseDecreaseInOtherNoncurrentAssets" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentAssets"/>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationUpfrontConsiderationPaidInCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The aggregate amount of consideration paid to former stockholders and optionholders in common stock, as part of a business combination, excluding purchase price adjustments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationUpfrontConsiderationPaidInCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business combination upfront consideration paid in common stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Reconciliation of Income Tax Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net loss attributable to common stockholders</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Income (Loss) Available to Common Stockholders, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationYearUnderExamination_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Examination, Year under Examination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExaminationYearUnderExamination_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income tax examination, year under examination</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosuresAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Disclosures [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PrimeMedicineIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prime Medicine Inc</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PrimeMedicineIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prime Medicine Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PrimeMedicineIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Prime medicine Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 1</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel1Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 1 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Fair Value Adjustment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesFairValueAdjustment_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Accrued Liabilities [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAccruedLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Accrued Expenses and Other Current Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationContingentConsiderationLiabilityExpectedAchievementYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Contingent Consideration Liability Expected Achievement Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationContingentConsiderationLiabilityExpectedAchievementYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The year in which achievement is expected to be attained for contingent consideration liability milestones.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationContingentConsiderationLiabilityExpectedAchievementYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone liabilities projected year of achievement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManufacturingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Manufacturing Facility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ManufacturingFacilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Manufacturing Facility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2025</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Three</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DomesticCountryMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Domestic Tax Authority [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, New Issues</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Value of common stock shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock from initial public offering/private placement/At-the-Market offering, net of issuance costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpensePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and Development Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpensePolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Expense, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Financing Activities [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected dividend yield</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContributionOfProperty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash contribution of intellectual property to Orbital Therapeutics Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContributionOfProperty_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contribution of Property</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicenseAgreementTermsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License Agreement Terms [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LicenseAgreementTermsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License Agreement Terms</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Measurement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueDisclosureItemAmountsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SanaBiotechnologyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Sana Biotechnology.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SanaBiotechnologyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sana Biotechnology</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AmendmentFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amendment Flag</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate fair value of restricted shares vested</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryAmountReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount receivable on the one-year anniversary of the signing date of a collaboration agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryAmountReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement First Anniversary Amount Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryAmountReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement first anniversary amount receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalExpendituresIncurredButNotYetPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment additions in accounts payable and accrued expenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CapitalExpendituresIncurredButNotYetPaid_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capital Expenditures Incurred but Not yet Paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum number of shares for future issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Number of shares available for future issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontPaymentFairValueSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The fair value of shares received as an upfront payment as part of license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontPaymentFairValueSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Upfront Payment Fair Value Shares Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontPaymentFairValueSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Upfront payment fair value shares received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Loss Carryforwards [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Loss Carryforwards [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ReimbursedCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Reimbursed Costs [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ReimbursedCostsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reimbursed Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LitigationCaseTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Litigation Case [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease right-of-use assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Right-of-Use Asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardAmountWithLimitOnUse_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforward amount with limit on use</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardAmountWithLimitOnUse_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Operating Loss Carryforward Amount with Limit on Use</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardAmountWithLimitOnUse_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Net operating loss carryforward amount with limit on use.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AtTheMarketMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">At-The-Market</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AtTheMarketMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ATM Offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AtTheMarketMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">At-The-Market .</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AtTheMarketMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">At The Market [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: imputed interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, Undiscounted Excess Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net Loss Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerSharePolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsInterestPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance lease liability payments interest percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsInterestPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease Liability Payments Interest Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsInterestPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The interest rate on finance leases.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Carrying value of equity method investment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Method Investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PfizerIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Pfizer Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PfizerIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Pfizer Inc</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statement [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term lease liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Payment of interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Interest Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value of contingent consideration liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in fair value of contingent consideration liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change In Fair Value Of Contingent Consideration Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInFairValueOfContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of increase (decrease) in the fair value of contingent consideration recognized in the income statement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateImmaterialEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Accounting Principle, Accounting Standards Update, Immaterial Effect</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateImmaterialEffect_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating cash flows used for operating leases</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeasePayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Payments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase of common stock under ESPP, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Employee Stock Purchase Plans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of operating segment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NumberOfOperatingSegments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Operating Segments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Preferred Stock, Shares Outstanding, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Preferred Stock, Shares Outstanding, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares reserved for future issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Capital Shares Reserved for Future Issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorFirmId_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Firm ID</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Unvested as of December 31, 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Unvested as of December 31, 2021</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vested</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BioPalettePatentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Bio Palette Patent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BioPalettePatentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Bio Palette Patent [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BioPalettePatentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Bio Palette Patent.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Guide Acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Tax Authority</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Authority [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductOrServiceAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilityForUncertainTaxPositionsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Uncertain tax positions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilityForUncertainTaxPositionsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liability for Uncertainty in Income Taxes, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ESPP</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInFinancingMilestoneLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing milestone liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInFinancingMilestoneLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase Decrease In Financing Milestone Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInFinancingMilestoneLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (decrease) in financing milestone liabilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Business Combination, Contingent Consideration, Liability, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Contingent consideration liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee compensation and related benefits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employee-related Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeRelatedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Employee-related Liabilities, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Leases [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeasesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leases</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncashOrPartNoncashAcquisitionDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Noncash or Part Noncash Acquisition, Description</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NoncashOrPartNoncashAcquisitionDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Merger agreement description</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Unvested Stock Options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeStockOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Outstanding Options to Purchase Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average remaining lease term (years)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Remaining Lease Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities and stockholders' equity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities and Equity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxPeriodAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Period [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesLeasingArrangements_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">ROU asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesLeasingArrangements_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Leasing Arrangements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsForProceedsFromTenantAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tenant improvement allowance</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwardsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating Loss Carryforwards [Line Items]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Harvard Institute.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Harvard Institute [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Harvard Institute</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plan Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PlanNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Plan Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AreaOfRentedSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Area of Rented Space</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AreaOfRentedSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Square feet of office and laboratory space</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Corporate Equity Securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Available For Sale Debt Securities and Equity Securities FV-Ni</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Marketable securities held, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of investment in debt and equity securities measured at fair value (available-for-sale).</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScientificFoundersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Scientific Founders</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScientificFoundersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scientific Founders [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScientificFoundersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Scientific founders.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Denominator:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Diluted [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Accounting Principle, Accounting Standards Update, Adopted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdopted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Accounting Principle, Accounting Standards Update, Adopted [true false]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Liability, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Discount for Lack of Marketability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Discount Rate [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputDiscountRateMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Discount Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Incorporation, State or Country Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Statement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfOperatingLeaseRenewalOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, number of renewal options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfOperatingLeaseRenewalOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Operating Lease Renewal Options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfOperatingLeaseRenewalOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of operating lease renewal options.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non United States</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonUsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non-US [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Reverse stock split</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity, Reverse Stock Split</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityReverseStockSplit_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Reverse stock split</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OrbitalTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Orbital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OrbitalTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Orbital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OrbitalTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Orbital Therapeutics, Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OrbitalTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Orbital Therapeutics, Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature of the Business and Basis of Presentation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from issuances of stock under ESPP</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromStockPlans_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Stock Plans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other liabilities assumed</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current portion of equipment financing liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SaleOfStockNameOfTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate intrinsic value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Aggregate Intrinsic Value [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateIntrinsicValueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Share based compensation arrangement by share based payment award aggregate intrinsic value.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combinations Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Contingent Consideration Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchase of common stock under ESPP</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Employee Stock Purchase Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Loss Carryforwards</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLossCarryforwards_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Operating Loss Carryforwards, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Nondeductible/ nontaxable permanent items</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2025</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Three</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAcquiredFromAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash Acquired from Acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAcquiredFromAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net cash acquired from Guide</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition, Acquiree</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionAcquireeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Acquiree [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recurring</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsRecurringMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalSuccessPaymentAmountDue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Additional success payment amount due.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalSuccessPaymentAmountDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Success Payment Amount Due</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalSuccessPaymentAmountDue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional success payment amount due</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseTerminationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, termination month and year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseTerminationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Termination Month And Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseTerminationMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating lease, termination month and year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Short-term lease costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShortTermLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Short-Term Lease, Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TransactionPriceAllocatedToEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Transaction price allocated to each performance obligations.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TransactionPriceAllocatedToEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Transaction Price Allocated to Each Performance Obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TransactionPriceAllocatedToEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transaction price allocated to each of six performance obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Contract with Customer, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInContractWithCustomerLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DevelopmentRegulatoryAndCommercialMilestonesReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Development Regulatory and Commercial Milestones Receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DevelopmentRegulatoryAndCommercialMilestonesReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Development regulatory and commercial milestones receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DevelopmentRegulatoryAndCommercialMilestonesReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of milestones the Company may be eligible to receive.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncurrentAssetsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Noncurrent Assets [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssignedToCompanyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Assigned to company.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssignedToCompanyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assigned to Company [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssignedToCompanyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assigned to Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ExploitationLicensesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exploitation Licenses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ExploitationLicensesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Exploitation Licenses [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ExploitationLicensesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Exploitation licenses.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average discount rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseWeightedAverageDiscountRatePercent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Weighted Average Discount Rate, Percent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfUpfrontFee_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Upfront fee paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfUpfrontFee_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Of Upfront Fee</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfUpfrontFee_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment of upfront fee.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_EquityMethodInvesteeNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfRevenueExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue, Product and Service [Extensible List]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TypeOfRevenueExtensibleList_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Product and Service [Extensible Enumeration]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Small Business</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntitySmallBusiness_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Small Business</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OfficeAndLaboratorySpaceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Office and Laboratory Space</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationRelatedCostsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-Based Compensation</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Measurement Inputs and Valuation Techniques [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Goodwill and Intangible Assets, Intangible Assets, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GoodwillAndIntangibleAssetsIntangibleAssetsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Patent Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreasePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The automatic increase in the number of shares that may be issued under a share-based payment arrangement on the first day of each fiscal year, as a percentage of shares outstanding.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreasePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Annual Increase Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreasePercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Annual percentage increase in shares authorized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationCommonSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of shares of common stock received as part of a collaboration agreement.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentQuotedMarketValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement aggregate transaction price</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total current assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property Plant And Equipment [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueProgramPerformanceObligationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue Program Performance Obligation Period</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueProgramPerformanceObligationPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The period over which performance obligations are expected to be recognized.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisAndPfizerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Apellis and Pfizer</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisAndPfizerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Apellis and Pfizer [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisAndPfizerMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Apellis and Pfizer.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Weighted - average common shares outstanding, basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average common shares outstanding, basic and diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Weighted Average Number of Shares Outstanding, Basic, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Weighted Average Number of Shares Outstanding, Basic</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Finance Lease, Liability, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CityAreaCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">City Area Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Forfeitures</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Liabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Private Placement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrivatePlacementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Private Placement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentPeriodEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Period End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedTerseLabel">Payment of equity offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Payment of initial and follow-on public offering costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsOfStockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments of Stock Issuance Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease Contractual Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseContractualTermDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Contractual Term [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Unvested Restricted Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Restricted Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Method Investment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Method Investments and Joint Ventures Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementPerformanceObligationRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement Performance Obligation Revenue Recognized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementPerformanceObligationRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of revenue recognized during the period for satisfaction of performance obligations as part of a collaboration agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementPerformanceObligationRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement performance obligation revenue recognized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Construction in Process</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConstructionInProgressMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Construction in Progress [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average grant date fair value per share of stock options granted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseRenewalTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, option to extend term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseRenewalTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Renewal Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale, Amortized Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Available-for-sale, Amortized Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contract with Customer, Liability, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContractWithCustomerLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term portion of deferred revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonRoyaltySublicenseFeesOwed_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Royalty Sublicense Fees Owed</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonRoyaltySublicenseFeesOwed_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-royalty sublicense fees owed</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Assets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionOtherRevenuesFromTransactionsWithRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income from related party</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonrefundableUpfrontPaymentReceivable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonrefundable upfront payment receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GrossProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Gross proceeds from issuance of common stock.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GrossProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Gross Proceeds From Issuance Of Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GrossProceedsFromIssuanceOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gross proceeds from issuance of common stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StateAndLocalJurisdictionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">State and Local Jurisdiction [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerformanceBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Performance-based Stock Options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerformanceBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Performance Based Stock Options [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerformanceBasedStockOptionsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Performance-based stock options.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Success payment liability, term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative, Term of Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Earnings Per Share, Diluted, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnings Per Share, Diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarningsPerShareDiluted_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net loss per common share attributable to common stockholders, diluted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Potential Common Shares Excluded from Computation of Diluted Net Loss per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressPostalZipCode_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Postal Zip Code</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseAnnualRent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The annual rent amount under a financing lease.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseAnnualRent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease Annual Rent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseAnnualRent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance lease annual rent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommencementOfSecondPhaseOfLeaseInJanuaryTwoThousandTwentyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Commencement of second phase of lease in January two thousand twenty one.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommencementOfSecondPhaseOfLeaseInJanuaryTwoThousandTwentyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commencement Of Second Phase Of Lease In January Two Thousand Twenty One [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommencementOfSecondPhaseOfLeaseInJanuaryTwoThousandTwentyOneMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Second Phase of Lease in January 2021</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Fiscal Period Focus</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Offering Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredOfferingCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity issuance costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: valuation allowance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Valuation Allowance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Deferred Tax Assets, Valuation Allowance, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, $0.01 par value; 25,000,000 shares authorized, and no shares issued or outstanding at December 31, 2022 and December 31, 2021, respectively</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Value, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Preferred Stock, Value, Issued, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Preferred Stock, Value, Issued, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Preferred Stock, Value, Issued, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">APIC, Share-Based Payment Arrangement, Increase for Cost Recognition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock-based compensation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Five</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RepurchaseAgreementCounterpartyNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Operating Lease, Liability, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lease liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Total operating lease liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by financing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInFinancingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Financing Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average grant date fair value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Property and equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Liabilities, Property, Plant and Equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfFinancialPositionAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Financial Position [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity File Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFileNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Securities Act File Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioUnspecifiedDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scenario [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardLimitPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The percentage of annual taxable income to which net operating loss carryforwards are limited.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardLimitPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforward limit percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardLimitPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Operating Loss Carryforward Limit Percentage</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialMilestonePayableInFormOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Potential Milestone Payable In Form Of Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialMilestonePayableInFormOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of potential milestones payable in the form of common stock as part of a business combination.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialMilestonePayableInFormOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Potential milestone payable in form of common stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfCashFlowsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Cash Flows [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, after Year Five</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Thereafter</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Sublease income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sublease Income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubleaseIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sublease income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationTechniqueDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Valuation Approach and Technique [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncludingTwoThousandSeventeenPlanSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Including Two Thousand Seventeen Plan Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncludingTwoThousandSeventeenPlanSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Including Two Thousand Seventeen Plan Shares [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncludingTwoThousandSeventeenPlanSharesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Including 2017 Plan Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScheduleOfSuccessPaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Success Payment Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScheduleOfSuccessPaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule Of Success Payment Liability Table [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScheduleOfSuccessPaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of the success payment liability arising from a licensing agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary Of Significant Accounting Policies [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Summary Of Significant Accounting Policies [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SummaryOfSignificantAccountingPoliciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Summary of significant accounting policies.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Geographical</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_SegmentGeographicalDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Geographical [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Statistical Measurement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_RangeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statistical Measurement [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Broad Institute</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Broad License Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Broad license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Broad License Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StatementOfStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Statement of Stockholders' Equity [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sale of Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsidiarySaleOfStockAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sale of Stock [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorLocation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Location</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class of Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contract Balances</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LegalEntityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Legal Entity</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetProfitsAndDevelopmentAndCommercializationCostsPercentage_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The percentage of net profits and development and commercialization costs assigned to the specified party.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ReceiptOfCommonStockInExchangeForTechnologyLicense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Receipt of common stock in exchange for technology license</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ReceiptOfCommonStockInExchangeForTechnologyLicense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Receipt Of Common Stock In Exchange For Technology License</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ReceiptOfCommonStockInExchangeForTechnologyLicense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The value of common stock received in exchange for a technology license.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Success payments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Success Payments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of success payments payable upon achievement of specified stock value targets.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrecognized compensation cost related to unvested stock options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IssuanceOfCommonStockSharesRelatedToLicenseAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock related to license agreement, Shares</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IssuanceOfCommonStockSharesRelatedToLicenseAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares issued during the period related to a license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial Paper</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommercialPaperMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial Paper [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nature Of Business And Basis Of Presentation [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nature Of Business And Basis Of Presentation [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NatureOfBusinessAndBasisOfPresentationTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nature of the business and basis of presentation.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Current Fiscal Year End Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisePricePerShareOfStockOptionsOnFairMarketValueOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Percentage of exercise price per share of stock options on fair market value of common stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisePricePerShareOfStockOptionsOnFairMarketValueOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Exercise Price Per Share Of Stock Options On Fair Market Value Of Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfExercisePricePerShareOfStockOptionsOnFairMarketValueOfCommonStock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The minimum exercise price per share of stock options, as a percentage of the fair market value of common stock on the date of grant.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByLiabilityClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liability Class [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Marketable Securities, Realized Gain (Loss), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Marketable Securities, Realized Gain (Loss)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MarketableSecuritiesRealizedGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Realized gains or losses recognized on sale or maturity of marketable securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Depreciation expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Depreciation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_Depreciation_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instruments [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement Upfront Payment Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of upfront payment received as part of a collaboration agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement upfront payment received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Obligation to Issue Common Stock Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of shares of stock the Collaborator is obligated to issue to the Company if the Company elects to extend the collaboration.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Obligation to issue common stock shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Assets, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAssetsNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Assets, Noncurrent, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination transaction price.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Transaction Price [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transaction price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Amortization of investment discount (premiums)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment Income, Net, Amortization of Discount and Premium</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeNetAmortizationOfDiscountAndPremium_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Investment Income, Net, Amortization of Discount and Premium, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Address, Address Line One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityAddressAddressLine1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Address, Address Line One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteesIndemnificationsAndWarrantiesPolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Guarantees and Indemnifications</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteesIndemnificationsAndWarrantiesPolicies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guarantees, Indemnifications and Warranties Policies [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementExtensionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Arrangement Extension Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementExtensionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration arrangement extension term.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementExtensionTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration arrangement extension term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Milestone payment paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payment Of Milestone Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PaymentOfMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Payment of milestone amount.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfEquityInstrumentsIssuedInConnectionWithAssetAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Fair value of equity instruments issued in connection with asset acquisition.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfEquityInstrumentsIssuedInConnectionWithAssetAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Of Equity Instruments Issued In Connection With Asset Acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfEquityInstrumentsIssuedInConnectionWithAssetAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of equity instruments issued in connection with asset acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Annual Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentAnnualReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Annual Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Share-Based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Assumptions Used in Black-Scholes Option Valuation Model to Estimate Fair Value of Purchase Right Under ESPP</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisPharmaceuticalsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Apellis</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisPharmaceuticalsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Apellis Pharmaceuticals Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisPharmaceuticalsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Apellis Pharmaceuticals, Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ApellisPharmaceuticalsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Apellis Pharmaceuticals, Inc</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finite-Lived Intangible Assets by Major Class [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SupplementalCashFlowInformationAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental disclosure of cash flow information:</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Marketable Securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfFounderShareholders_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number Of Founder Shareholders</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfFounderShareholders_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of founder shareholders.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ContingentConsiderationTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RestrictedCashNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Restricted cash</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_JeffriesLlcAmendedSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Jeffries LLC Amended Sales Agreement [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxExpenseBenefit_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Provision for income taxes</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Preferred Stock, Shares Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PreferredStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Preferred Stock, Shares Issued, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Balance Sheet Location</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BalanceSheetLocationDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Balance Sheet Location [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ContingentConsiderationLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent consideration liabilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ContingentConsiderationLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Contingent Consideration Liabilities [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ContingentConsiderationLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contingent Consideration Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Accrued Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherAccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Purchases of property and equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Property, Plant, and Equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Payments to Acquire Property, Plant, and Equipment, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue, Remaining Performance Obligation, Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRemainingPerformanceObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Allocated transaction price to each of six performance obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EquityIssuanceCostsPoliciesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity Issuance Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EquityIssuanceCostsPoliciesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Issuance Costs Policies Policy [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EquityIssuanceCostsPoliciesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for equity issuance costs.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in Accounting Principle, Accounting Standards Update, Adoption Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ChangeInAccountingPrincipleAccountingStandardsUpdateAdoptionDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in Accounting Principle, Accounting Standards Update, Adoption Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TemporaryEquityConversionOfRedeemableConvertiblePreferredStockToCommonStockUponClosingOfInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of redeemable convertible preferred stock to common stock upon closing of initial public offering, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TemporaryEquityConversionOfRedeemableConvertiblePreferredStockToCommonStockUponClosingOfInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity Conversion Of Redeemable Convertible Preferred Stock To Common Stock Upon Closing Of Initial Public Offering Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TemporaryEquityConversionOfRedeemableConvertiblePreferredStockToCommonStockUponClosingOfInitialPublicOfferingShares_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The number of shares converted upon the conversion of convertible securities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UponParticipationElectionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Upon participation election.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UponParticipationElectionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Upon Participation Election [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UponParticipationElectionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Upon Participation Election</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in operating lease right-of-use assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change In Operating Lease Right Of Use Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ChangeInOperatingLeaseRightOfUseAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of increase (decrease) in operating lease right-of-use assets.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EmployeesOfficersBoardOfDirectorsAndConsultantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employees, Officers, Board of Directors and Consultants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EmployeesOfficersBoardOfDirectorsAndConsultantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Employees Officers Board Of Directors And Consultants [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EmployeesOfficersBoardOfDirectorsAndConsultantsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Employees, officers, board of directors and consultants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of common stock issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock from initial public offering/private placement/At-the-Market offering, net of issuance costs, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesNewIssues_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Shares issued and sold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DirectFinancingLeaseResidualValueOfLeasedAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Plus: residual values</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DirectFinancingLeaseResidualValueOfLeasedAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Direct Financing Lease, Residual Value of Leased Asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarliestTaxYearMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earliest Tax Year [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EarliestTaxYearMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earliest Tax Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CarryingReportedAmountFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Carrying Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CarryingReportedAmountFairValueDisclosureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Reported Value Measurement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Fair Value Disclosure [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalFeePerAdditionalOptionRight_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of fee per additional option right.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalFeePerAdditionalOptionRight_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Fee Per Additional Option Right</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AdditionalFeePerAdditionalOptionRight_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional fee per additional option right</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByFairValueHierarchyLevelAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Hierarchy and NAV [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Conversion of redeemable convertible preferred stock to common stock upon closing of the initial public offering</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConversionOfStockAmountConverted1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Conversion of Stock, Amount Converted</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_AuditorName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Auditor Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Four</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, commencement month and year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Commencement Month And Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Operating lease, commencement month and year.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forfeitures</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other long-term liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase (Decrease) in Other Noncurrent Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Loss from operations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingIncomeLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Income (Loss)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease, option to extend</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseOptionToExtend_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Option to Extend</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Offering Period Start Date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The commencement date of the first offering period of a share based payment plan, in YYYY-MM-DD format.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardOfferingPeriodStartDate_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Common stock, offering period, start date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Redeemable convertible preferred stock, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Redeemable convertible preferred stock, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Temporary Equity, Carrying Amount, Attributable to Parent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquityCarryingAmountAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redeemable convertible preferred stock (See Note 11, Redeemable convertible preferred stock)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_StatementScenarioAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Scenario [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Collaborative Arrangements And Noncollaborative Arrangement Transactions [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfCollaborativeArrangementsAndNoncollaborativeArrangementTransactionsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement and Arrangement Other than Collaborative [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development in Process</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Research and development expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentInProcess_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">In-process research and development charge</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedProfessionalFeesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Professional fees</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedProfessionalFeesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Professional Fees, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, voting rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockVotingRights_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Voting Rights</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityFilerCategory_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Filer Category</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Equity Method Investments [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Available For Sale Debt Securities and Equity Securities FV-Ni Accumulated Gross Unrealized Loss Before Taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTaxes_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Marketable securities held, Gross Unrealized Losses</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNiAccumulatedGrossUnrealizedLossBeforeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount, before tax, of unrealized loss on investment in debt and equity securities measured at fair value (available-for-sale).</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DebtSecuritiesAvailableForSaleMaturityPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-sale, Maturity Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DebtSecuritiesAvailableForSaleMaturityPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Describes the period of time in which investments will reach maturity.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DebtSecuritiesAvailableForSaleMaturityPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Contractual maturity dates of investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Other comprehensive income (loss)</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_IcfrAuditorAttestationFlag_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ICFR Auditor Attestation Flag</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EquitySharesHeld_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Shares Held</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combinations [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquity_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total stockholders' equity</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuanceCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock issuance costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InProcessResearchAndDevelopmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">In Process Research and Development [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedOtherComprehensiveIncomeMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">AOCI Attributable to Parent [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Asset Class</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByAssetClassAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Class [Axis]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Tax Identification Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Tax Identification Number</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeStatementLocationAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Statement Location</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Forfeited</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forfeited</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Value, Issued, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Value, Issued, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common stock, value</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LabEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Lab Equipment</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LabEquipmentMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Lab equipment.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationVariableInterestEntityPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Variable Interest Entities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationVariableInterestEntityPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consolidation, Variable Interest Entity, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount received as upfront payment under a license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License Agreement Upfront Payment Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementUpfrontPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License agreement upfront payment received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Receivable Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amounts due as part of a collaboration agreement, due within 1 year (or 1 business cycle).</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationReceivableCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration receivable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CapitalizedRDCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of costs capitalized for research and development as of the balance sheet date.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CapitalizedRDCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Capitalized research and development costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CapitalizedRDCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Capitalized R&amp;D Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityMethodInvestmentsAndJointVenturesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Method Investments and Joint Ventures [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition, Date of Acquisition Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionDateOfAcquisitionAgreement1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Business Acquisition, merger agreement date</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityEmergingGrowthCompany_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Emerging Growth Company</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Transaction</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommonStockReceivedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Common stock received.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommonStockReceivedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Business Acquisitions, by Acquisition [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating expenses:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingExpensesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Expenses [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sublease Commencement Month and Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The month and year in which a sublease will commence.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseCommencementMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sublease, commencement month and year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Volatility of Market Participants</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected Volatility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputPriceVolatilityMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Price Volatility [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Verve Therapeutics, Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Verve Therapeutics Inc [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveTherapeuticsIncMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Verve Therapeutics, Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommercialMilestonePaymentsOrRoyaltiesDue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commercial milestone payments or royalties due</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommercialMilestonePaymentsOrRoyaltiesDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commercial Milestone Payments Or Royalties Due</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommercialMilestonePaymentsOrRoyaltiesDue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of commercial milestone payments or royalties due.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maturities of marketable securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue Recognition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueRecognitionPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockByClassTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Stock By Class [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfStockByClassTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Stock by Class [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Letter of Credit [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LetterOfCreditMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Letter of Credit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected term (in years)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonCashResearchAndDevelopmentLicenseExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Non Cash Research And Development License Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonCashResearchAndDevelopmentLicenseExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Non-cash research and development license expense, net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonCashResearchAndDevelopmentLicenseExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of noncash research and development expense for licensing agreements.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_JeffriesLlcSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Jeffries LLC Sales Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_JeffriesLlcSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Jeffries LLC sales agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_JeffriesLlcSalesAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Jeffries LLC Sales Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPaymentsValuationMultiples_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Success Payments, valuation multiples</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPaymentsValuationMultiples_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Success Payments Valuation Multiples</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SuccessPaymentsValuationMultiples_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The valuation multiple applied to the initial weighted average of the specified class of stock, used to determine success payment targets.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Upfront Revenue Recognized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of upfront revenue recognized.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontRevenueRecognized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Upfront revenue recognized</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GuideTherapeuticsIncorporatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Guide Therapeutics, Inc.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GuideTherapeuticsIncorporatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Guide Therapeutics Incorporated [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_GuideTherapeuticsIncorporatedMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Guide Therapeutics, Incorporated.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AccruedResearchCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Research Costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AccruedResearchCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Carrying value as of the balance sheet date of obligations incurred through that date and payable for research costs. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AccruedResearchCosts_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DebtSecuritiesAvailableForSaleTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment, Name [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Voluntary Filers</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityVoluntaryFilers_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Voluntary Filers</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EarnoutPaymentPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Earn-out payment period.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EarnoutPaymentPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Earnout Payment Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EarnoutPaymentPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Earn-out payment period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DefinedContributionPlanName_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Defined contribution plan name.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DefinedContributionPlanName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DefinedContributionPlanName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Defined contribution plan name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndRetirementDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Retirement Benefits [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsDerivativeInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Derivative liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsDerivativeInstruments_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Derivative Instruments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Document Transition Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_DocumentTransitionReport_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Document Transition Report</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Fair Value Disclosure</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsFairValueDisclosure_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses and other assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfCommonStockIssuedToSettleSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The fair value of common stock issued to satisfy a success payment obligation.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfCommonStockIssuedToSettleSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value Of Common Stock Issued To Settle Success Payment Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FairValueOfCommonStockIssuedToSettleSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of common stock issued to settle success payment liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonoperating Income (Expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonoperatingIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total other income (expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrued Expenses and Other Current Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountsPayableAccruedLiabilitiesAndOtherLiabilitiesDisclosureCurrentTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement first anniversary payment received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement First Anniversary Payment Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementFirstAnniversaryPaymentReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount received as payment for the first anniversary of a collaboration agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Depreciation, Depletion and Amortization, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DepreciationDepletionAndAmortization_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Depreciation, Depletion and Amortization</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ShareBasedCompensationArrangementByShareBasedPaymentAwardWeightedAverageRemainingContractualLifeAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Remaining Contractual Life [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseLiabilityCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current portion of lease liability</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementNatureAndPurpose_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">License agreement description</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementNatureAndPurpose_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement, Nature and Purpose</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashAndCashEquivalentsRestrictedCashAndCashEquivalentsPolicy_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating activities</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquityComponentDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Component [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodValueSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period Value Success Payment Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodValueSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Value of stock issued to satisfy success payment obligation.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Payments to Acquire Debt Securities, Available-for-Sale</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Revenue from Contract with Customer, Excluding Assessed Tax, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue from Contract with Customer, Excluding Assessed Tax</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License and collaboration revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">License revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net loss before income taxes</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Less: amounts representing interest at 8.76%</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less: amounts representing interest at 8.76%</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Purchases from related party</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2026</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FounderShareholdersMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Founder Shareholders.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LeaseholdImprovementsLandlordAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Leasehold Improvements Landlord Allowance</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity securities included in marketable securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Equity securities, Amortized Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNi_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity securities, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The year in which net operating loss carryforwards begin to expire.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Operating Loss Carryforwards Expiration Starting Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NetOperatingLossCarryforwardsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards expiration starting year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Recurring and Nonrecurring [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AreaOfFacilityBeingBuilt_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Area Of Facility Being Built</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AreaOfFacilityBeingBuilt_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The area of a facility being built for future lease, in square feet.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AreaOfFacilityBeingBuilt_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Manufacturing facility, number of square feet</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingenciesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loss Contingencies [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Security Exchange Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_SecurityExchangeName_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Exchange Name</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Class Of Stock [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ClassOfStockLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Class of Stock [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-term equipment financing liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityNoncurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, Noncurrent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LeaseCostsIncludedInMeasurementOfLeaseLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease Costs Included In Measurement Of Lease Liabilities [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LeaseCostsIncludedInMeasurementOfLeaseLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of the lease costs included in the measurement of lease liabilities.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LeaseCostsIncludedInMeasurementOfLeaseLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Lease Costs Included in Measurement of Lease Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Significant Accounting Policies</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SignificantAccountingPoliciesTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Significant Accounting Policies [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash provided by (used in) operating activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInOperatingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProceedsFromFinanceLease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Proceeds From Finance Lease</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProceedsFromFinanceLease_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of cash inflow from draw down on funds for a finance lease.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProceedsFromFinanceLease_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Proceeds from equipment financings</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Unrecognized compensation cost, cost to recognize over a weighted-average period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLossCarryforwardNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net operating loss carryforwards not subject to expiration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLossCarryforwardNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Loss Carryforward Not Subject To Expiration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLossCarryforwardNotSubjectToExpiration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of operating loss carryforward that is not subject to expiration.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExpectedTermMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected Term (years)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputExpectedTermMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input, Expected Term [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease costs</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OperatingLeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease, Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Interest and Other Income (Expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest and Other Income (Expense), Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest And Other Income Expense [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Interest and other income (expense).</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAllocatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Business combination transaction price allocated.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAllocatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Transaction Price Allocated [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationTransactionPriceAllocatedAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Transaction price allocated</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TaxCreditsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax credits expiration starting year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TaxCreditsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Credits Expiration Starting Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TaxCreditsExpirationStartingYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The year in which specified tax credits begin to expire.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodSharesSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares issued to satisfy success payment obligation.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodSharesSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Issuance of common stock for success payment liability, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodSharesSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Issuance of common stock for success payment liability, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_StockIssuedDuringPeriodSharesSuccessPaymentLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock for success payment liability, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Future Minimum Lease Payments of Operating Leases</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, Maturity [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseAreaOfRentedSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Sublease Area Of Rented Space</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseAreaOfRentedSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of space to be subleased, in square feet.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_SubleaseAreaOfRentedSpace_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Sublease area of rented space</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Principles of Consolidation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ConsolidationPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Consolidation, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2024</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease, Liability, to be Paid, Year Two</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Potential Consideration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Potential total consideration</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PotentialConsideration_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Potential aggregate consideration that may be received as part of a collaboration agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in valuation allowance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Intangible assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Option Activity Under Equity Award Plans</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Option, Activity [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Recently adopted accounting pronouncements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">New Accounting Pronouncements, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Outstanding</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Common Stock, Shares, Outstanding, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Common Stock, Shares, Outstanding, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessAcquisitionLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Acquisition [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OverAllotmentOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Underwriters Option</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OverAllotmentOptionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Over-Allotment Option [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Research and development tax credits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 2</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel2Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 2 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Debt Securities, Available-for-sale, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Marketable securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AvailableForSaleSecuritiesDebtSecurities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Available-for-sale, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ResearchPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ResearchPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ResearchPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Research plan.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Investing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Investing Activities [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commitments and contingencies (See Note 7, Leases, Note 10, License agreements and Note 11, Collaboration and license agreements)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommitmentsAndContingencies_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commitments and Contingencies</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Authority, Name [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Milestone payment shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Common Stock, Shares, Issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesIssued_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Common Stock, Shares, Issued, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Obligation to Issue Common Stock Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The value of stock the Company is obligated to issue to the Collaborator if the Company elects to extend the collaboration.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ObligationToIssueCommonStockValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Obligation to issue common stock value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Arrangement Initial Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration arrangement initial term.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationArrangementInitialTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration arrangement, initial term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USTreasurySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">U.S. Treasury Securities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_USTreasurySecuritiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">US Treasury Securities [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputProbabilityOfAchievementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Probability Of Achievement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputProbabilityOfAchievementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Measurement Input Probability Of Achievement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputProbabilityOfAchievementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Probability of Achievement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Minimum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Minimum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MinimumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Minimum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares description</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Description</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueRemainingForEachPerformanceObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Revenue Remaining for Each Performance Obligation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueRemainingForEachPerformanceObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue remaining for each performance obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueRemainingForEachPerformanceObligation_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of revenue allocated to each performance obligation.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Income Tax Authority, Name [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">License Agreements</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">License Agreement Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LicenseAgreementDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The entire disclosure for licensing arrangements with third parties, which includes, but is not limited to, success payments and milestone payments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MergerAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Merger Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MergerAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Merger Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MergerAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Merger agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MergerAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Guide Merger Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest and other income (expense), net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Interest And Other Income Expense Net</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_InterestAndOtherIncomeExpenseNet_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of interest income and income (expense) related to nonoperating activities classified as other.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leases and Rent Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeLeasesPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Leases [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Exercisable as of December 31, 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TwoThousandSeventeenStockOptionAndGrantPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2017 Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TwoThousandSeventeenStockOptionAndGrantPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Two Thousand Seventeen Stock Option And Grant Plan [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TwoThousandSeventeenStockOptionAndGrantPlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand seventeen stock option and grant plan.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseRentPaymentsBeginMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Rent Payments Begin Month And Year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseRentPaymentsBeginMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The month and year in which the rent payments will begin under an operating lease.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseRentPaymentsBeginMonthAndYear_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Rent payments beginning month and year</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Standards Update [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Accrual liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Liabilities, Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccruedLiabilitiesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accrued Liabilities, Current, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stockholders' Equity Attributable to Parent [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stockholders' equity:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">State income taxes, net of federal benefit</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_CounterpartyNameAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Counterparty Name [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Forfeited</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Canceled</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Award Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AwardTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Award Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncashIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Other</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncashIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Noncash Income (Expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OtherNoncashIncomeExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other Noncash Income (Expense), Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Subsequent Event</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SubsequentEventMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Subsequent Event [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferred1_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total transaction price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Transaction</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transaction [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total deferred tax assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LossContingenciesTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Loss Contingencies [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Impairment of Long-Lived Assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ImpairmentOrDisposalOfLongLivedAssetsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Aggregate intrinsic value of stock options exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration agreement term of contract.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement Term of Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement term of contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeDividend_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dividend received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentIncomeDividend_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investment Income, Dividend</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Research and development</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Research and Development Expense, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and development expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Undiscounted lease payments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeFinanceLeaseTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financing obligations, leased back equipment term of contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeFinanceLeaseTermOfContract1_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Finance Lease, Term of Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationLicenseAgreementFairValueOfSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration License Agreement Fair Value of Shares Received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationLicenseAgreementFairValueOfSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration license agreement fair value of shares received</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationLicenseAgreementFairValueOfSharesReceived_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The fair value of shares received as part of a collaboration and license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LaboratorySpaceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Laboratory Space</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LaboratorySpaceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Laboratory Space [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LaboratorySpaceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Laboratory space.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Operating lease term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseTermOfContract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Term of Contract</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Equity Securities, FV-NI, Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiCost_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Equity securities, Fair Value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiCost_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Equity securities, Amortized Cost</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInOperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in operating lease right-of-use assets</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInOperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Increase Decrease In Operating Lease Right Of Use Asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IncreaseDecreaseInOperatingLeaseRightOfUseAsset_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Increase (decrease) in operating lease right of use asset.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Lease Liability Payments [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease Liability Payments [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance lease liability payments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Central Index Key</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityCentralIndexKey_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Central Index Key</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Verve</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Verve [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_VerveMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Verve.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_GuaranteeObligationsCurrentCarryingValue_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Claims outstanding</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetIncomeLossAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Numerator:</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccountingPoliciesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accounting Policies [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputFairValueOfCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value of Common Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputFairValueOfCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Fair Value Of Common Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_MeasurementInputFairValueOfCommonStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Measurement input fair value of common stock.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Investments, Debt and Equity Securities [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_LitigationCaseAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Litigation Case [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LaboratoryEquipmentAndOfficeFurnitureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Laboratory Equipment and Office Furniture</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_LaboratoryEquipmentAndOfficeFurnitureMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Laboratory equipment and office furniture.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Debt Securities, Available-for-Sale [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Less accumulated depreciation</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AccountingStandardsUpdate202203Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">ASU 2022-03</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Property Plant And Equipment [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfSharesPurchasedUnderEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Number of Shares Purchased Under Equity Method</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NumberOfSharesPurchasedUnderEquityMethod_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Number of shares purchased under equity method.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Broad Institute.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Broad Institute [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BroadInstituteMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Broad Institute</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Frequency</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementFrequencyAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Frequency [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of shares available for future issuance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Stock Option and Grant Plan</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RedeemableConvertiblePreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Redeemable Convertible Preferred Stock</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RedeemableConvertiblePreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Redeemable Convertible Preferred Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementPerformanceObligationRevenuePeriodForRecognition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement performance obligation revenue period for recognition</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementPerformanceObligationRevenuePeriodForRecognition_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The period over which revenue is expected to be recognized as part of a collaboration agreement.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Input Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Organization, Consolidation and Presentation of Financial Statements [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEquityMethodInvestmentsTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Equity Method Investments [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Outstanding as of December 31, 2022</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Outstanding as of December 31, 2021</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted-average exercise price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationContingentConsiderationArrangementsDescription_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Contingent Consideration Arrangements, Description</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinanceLeasePrincipalPayments_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Paydown of principal</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentExpenseMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Research and Development Expense</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_IssuanceOfCommonStockValueRelatedToLicenseAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Issuance of common stock related to license agreement</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ScenarioForecastMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Forecast [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseCost_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lease, Cost</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employer matching contribution to 401(k) Plan as a percentage of employee's eligible earnings</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SecurityDeposit_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Security Deposit</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CollaborativeArrangementRightsAndObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaborative Arrangement, Rights and Obligations</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MoneyMarketFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Money Market Funds</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MoneyMarketFundsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Money Market Funds [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Input Type</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_MeasurementInputTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Input Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateContinuingOperations_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Total</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssembledWorkforceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assembled Workforce [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssembledWorkforceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Assembled Workforce.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssembledWorkforceMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Assembled Workforce</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination, Consideration Transferred, Equity Interests Issued and Issuable</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair value of equity instruments issued</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Research and Development Arrangement, Contract to Perform for Others, Type [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Total property and equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Property, Plant and Equipment, Gross, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Property, Plant and Equipment, Gross, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentGross_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Property, Plant and Equipment, Gross, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseTermAndDiscountRateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Operating Lease Term And Discount Rate [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OperatingLeaseTermAndDiscountRateTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Tabular disclosure of the lease term and discount rate for an operating lease.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Commission rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Commission Rate</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommissionRate_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The commission rate the Company agreed to pay for all shares sold under a Sales Agreement, as a percentage of gross sales proceeds.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Additional paid-in capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Additional Paid in Capital</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Additional Paid in Capital, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/periodStartLabel">Additional Paid in Capital, Beginning Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AdditionalPaidInCapital_lbl" xlink:role="http://www.xbrl.org/2003/role/periodEndLabel">Additional Paid in Capital, Ending Balance</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Interactive Data Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityInteractiveDataCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Interactive Data Current</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Tax credits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TaxCreditCarryforwardAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Tax Credit Carryforward, Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity Public Float</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityPublicFloat_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity Public Float</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScientificConsultingAndOtherExpensesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Scientific Consulting and Other Expenses</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScientificConsultingAndOtherExpensesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Scientific consulting and other expenses.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Per Program</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Per Program [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PerProgramMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Per program.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Related Party Transactions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsDisclosureTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions Disclosure [Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationConsiderationTransferredTechnologyAndProductContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Technology and product contingent consideration liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationConsiderationTransferredTechnologyAndProductContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Business combination liability for milestones at fair value</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationConsiderationTransferredTechnologyAndProductContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Business Combination Consideration Transferred Technology And Product Contingent Consideration Liabilities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_BusinessCombinationConsiderationTransferredTechnologyAndProductContingentConsiderationLiabilities_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Amount of contingent consideration liability for technology and product milestones incurred by the acquirer.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CashFlowNoncashInvestingAndFinancingActivitiesDisclosureAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Supplemental disclosure of non-cash investing and financing activities:</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EffectiveIncomeTaxRateReconciliationInProcessResearchAndDevelopmentAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Effective Income Tax Rate Reconciliation In Process Research And Development Acquisition</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EffectiveIncomeTaxRateReconciliationInProcessResearchAndDevelopmentAcquisition_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">IPR&amp;D Guide Acquisition</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EditasLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Editas License Agreement</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_EditasLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Editas License Agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_RelatedPartyTransactionsAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Related Party Transactions [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2023</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year One</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TwoThousandNineteenEquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2019 Plan</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_TwoThousandNineteenEquityIncentivePlanMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Two thousand nineteen equity incentive plan.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PrimeAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Prime Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_PrimeAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Prime Agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LeaseholdImprovementsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Leasehold Improvements</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_TemporaryEquitySharesOutstanding_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Preferred stock outstanding</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProceedsFromIssuanceInitialPublicOffering_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Gross proceeds from sale of common stock</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_LocalPhoneNumber_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Local Phone Number</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Federal statutory rate</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ScheduleOfChangeInFairValueOfSuccessPaymentLiabilityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Change in Fair Value of Success Payment Liability</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment [Abstract]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Weighted average exercise price</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePriceRollforward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employee Benefits</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CompensationAndEmployeeBenefitPlansTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Compensation and Employee Benefit Plans [Text Block]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RevenueRemainingForEachPerformanceObligationExpectedTimingOfSatisfactionPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Revenue remaining performance obligation, expected timing of satisfaction, period</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Expected volatility</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PrepaidExpenseAndOtherAssetsCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Prepaid expenses and other current assets</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Price per share of stock sold</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Shares Issued, Price Per Share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SharesIssuedPricePerShare_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Public offering price per share</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_RentalPaymentOverTermOfSublease_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Rental Payment Over Term of Sublease</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SeriesAPreferredStockMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Series A Preferred Stock [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Financial Instrument</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FinancialInstrumentAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Financial Instrument [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssetAcquisitionsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Asset Acquisitions [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssetAcquisitionsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Disclosure of accounting policy for asset acquisitions, both as part of a business combination and not as part of a business combination.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AssetAcquisitionsPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Asset Acquisitions</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Long-Lived Tangible Asset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentByTypeAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Long-Lived Tangible Asset [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Deferred revenue</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DeferredTaxAssetsDeferredIncome_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Deferred Tax Assets, Deferred Income</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTransactionPriceForEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Collaboration agreement transaction price for each performance obligations.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTransactionPriceForEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Collaboration Agreement Transaction Price for Each Performance Obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CollaborationAgreementTransactionPriceForEachPerformanceObligations_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Collaboration agreement transaction price to each of six performance obligations</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AmortizationOfRDTaxTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The term over which capitalized research and development costs will be amortized for tax purposes.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AmortizationOfRDTaxTerm_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Amortization of R&amp;D Tax Term</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Number of options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingRollForward_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Liabilities, redeemable convertible preferred stock, and stockholders&#8217; equity (deficit)</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesAndStockholdersEquityAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Liabilities and stockholders' equity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and Equipment</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AntidilutiveSecuritiesNameDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Antidilutive Securities, Name</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_IncomeTaxAuthorityAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Income Tax Authority</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ValuationTechniqueAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Valuation Approach and Technique [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NonvestedRestrictedStockSharesActivityTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Restricted Stock Activity</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ProfitLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Net loss</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AvailableForSaleDebtSecuritiesAndEquitySecuritiesFvNiAmortizedCostBasis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Available For Sale Debt Securities and Equity Securities FV-Ni Amortized Cost Basis</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AssetsCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Assets, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="stpr_MA_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Massachusetts</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule of Components of Deferred Taxes</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueMeasurementsFairValueHierarchyDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Fair Value Hierarchy and NAV</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_OtherPaymentsMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Other Payments [Member]</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Entity</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_EntityDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Entity [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AggregateMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The aggregate amount the Company is obligated to pay upon achievement of specified milestones.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AggregateMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Aggregate Milestone Amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AggregateMilestoneAmount_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Aggregate milestone amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_CoverAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Cover [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Interest or penalties for unrecognized tax benefits since inception</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product and Service</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_ProductsAndServicesDomain_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product and Service [Domain]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementBasisAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Measurement Basis</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueByMeasurementBasisAxis_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Measurement Basis [Axis]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">2027</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Lessee, Operating Lease, Liability, to be Paid, Year Five</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Vested</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProductDevelopmentAndRegulatoryApprovalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Product Development and Regulatory Approval.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProductDevelopmentAndRegulatoryApprovalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Product Development and Regulatory Approval [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ProductDevelopmentAndRegulatoryApprovalMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Product Development and Regulatory Approval</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonrefundableUpfrontPaymentReceivableDeferredRevenueLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Nonrefundable upfront payment receivable deferred revenue liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonrefundableUpfrontPaymentReceivableDeferredRevenueLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Nonrefundable Upfront Payment Receivable Deferred Revenue Liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_NonrefundableUpfrontPaymentReceivableDeferredRevenueLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Nonrefundable upfront payment receivable deferred revenue liability.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Current liabilities:</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_LiabilitiesCurrentAbstract_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Liabilities, Current [Abstract]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Maximum</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="srt_MaximumMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Maximum [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DisputeWithResearchInstitutionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Dispute with Research Institution</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DisputeWithResearchInstitutionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Dispute With Research Institution [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_DisputeWithResearchInstitutionMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Dispute with Research Institution.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Employer matching contribution to 401(k) Plan as a percentage of employee's contribution</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Defined Contribution Plan, Employer Matching Contribution, Percent of Match</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Summary of Stock-based Compensation Expense</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_NetCashProvidedByUsedInInvestingActivities_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Net cash used in investing activities</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Furniture and Fixtures</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FurnitureAndFixturesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Furniture and Fixtures [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/netLabel">Other income (expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Other income (expense)</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Equity securities recognition amount</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Change in fair value of non-controlling equity investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Change in fair value of non-controlling equity investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_EquitySecuritiesFvNiGainLoss_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Change in fair value of equity investments</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Computer Equipment and Software</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Computer Equipment And Software [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ComputerEquipmentAndSoftwareMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Computer equipment and software.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2009/role/negatedLabel">Exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise of common stock options, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Level 3</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_FairValueInputsLevel3Member_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Fair Value, Inputs, Level 3 [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Use of Estimates</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_UseOfEstimates_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Use of Estimates, Policy [Policy Text Block]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Vesting of restricted common stock, Shares</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Shares, Restricted Stock Award, Gross</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Success payment liability</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Derivative Liability, Subject to Master Netting Arrangement, before Offset</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_DerivativeFairValueOfDerivativeLiability_lbl" xlink:role="http://www.xbrl.org/2003/role/totalLabel">Derivative Liability, Fair Value, Gross Liability, Total</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Finance Lease Liability Payments [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Finance Lease Liability Payments [Line Items]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_FinanceLeaseLiabilityPaymentsLineItems_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Finance lease liability payments.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Exercise of common stock options</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Stock Issued During Period, Value, Stock Options Exercised</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_SegmentReportingPolicyPolicyTextBlock_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Segment and Geographic Information</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Property and equipment, estimated useful life</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_PropertyPlantAndEquipmentUsefulLife_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Property, Plant and Equipment, Useful Life</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_ContingentConsiderationOfTechnologyLiabilitiesMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Contingent consideration of technology liabilities.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontPaymentReceivedUnderTermOfAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">The amount of upfront payment received under the terms of an agreement.</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_UpfrontPaymentReceivedUnderTermOfAgreement_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Upfront payment received under term of agreement</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AlternativeInvestmentMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Alternate investment, measurement input</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_AlternativeInvestmentMeasurementInput_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Alternative Investment, Measurement Input</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="us-gaap_CommonStockSharesAuthorized_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Common stock, shares authorized</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Harvard</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Harvard License Agreement [Member]</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/documentation">Harvard license agreement.</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_HarvardLicenseAgreementMember_lbl" xlink:role="http://www.xbrl.org/2003/role/verboseLabel">Harvard</link:label>
    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_AccruedSubLicenseFeesCurrent_lbl" xlink:role="http://www.xbrl.org/2003/role/label">Accrued Sub License Fees Current</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="dei_TradingSymbol_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">Trading Symbol</link:label>
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    <link:label xml:lang="en-US" xlink:type="resource" xlink:label="beam_CommencementOfFirstPhaseOfLeaseInOctoberTwentyTwentyMember_lbl" xlink:role="http://www.xbrl.org/2003/role/terseLabel">First Phase of Lease in October 2020</link:label>
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