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  <xs:element name="ScheduleOfCompanySAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnARecurringBasisAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfCompanySAssetsAndLiabilitiesThatAreMeasuredAtFairValueOnARecurringBasisAbstract"/>
  <xs:element name="ScheduleOfBlackScholesModelAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfBlackScholesModelAbstract"/>
  <xs:element name="ScheduleOfChangesInTheFairValueOfLevel3FinancialAssetsAndLiabilitiesAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfChangesInTheFairValueOfLevel3FinancialAssetsAndLiabilitiesAbstract"/>
  <xs:element name="StandbyEquityPurchaseAgreementAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_StandbyEquityPurchaseAgreementAbstract"/>
  <xs:element name="ScheduleOfWarrantsToPurchaseCommonStockOutstandingAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfWarrantsToPurchaseCommonStockOutstandingAbstract"/>
  <xs:element name="ScheduleOfCompanySRestrictedStockUnitActivityAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfCompanySRestrictedStockUnitActivityAbstract"/>
  <xs:element name="ScheduleOfRecordedStockBasedCompensationExpenseAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ScheduleOfRecordedStockBasedCompensationExpenseAbstract"/>
  <xs:element name="SEPAPutRightsAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_SEPAPutRightsAsset"/>
  <xs:element name="PatentsNet" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_PatentsNet"/>
  <xs:element name="ChangeInFairValueOfForwardPuchaseAgreementAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOfForwardPuchaseAgreementAsset"/>
  <xs:element name="ChangeInFairValueOfSEPAPutRightsAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOfSEPAPutRightsAsset"/>
  <xs:element name="ChangeInFairValueOfEmbeddedDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOfEmbeddedDerivativeLiability"/>
  <xs:element name="ChangeInFairValueOfForwardPurchaseAgreementAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOfForwardPurchaseAgreementAsset"/>
  <xs:element name="ChangeInFairValueOfSEPAPutRightAsset" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOfSEPAPutRightAsset"/>
  <xs:element name="ChangeInFairValueOnEmbeddedDerivativeLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ChangeInFairValueOnEmbeddedDerivativeLiability"/>
  <xs:element name="AccruedIssuanceCostsForAdvanceShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_AccruedIssuanceCostsForAdvanceShares"/>
  <xs:element name="StandbyEquityPurchaseAgreementTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_StandbyEquityPurchaseAgreementTextBlock"/>
  <xs:element name="UnauditedInterimCondensedConsolidatedFinancialStatementsPolicyPolicyTextBlock" type="dtr:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_UnauditedInterimCondensedConsolidatedFinancialStatementsPolicyPolicyTextBlock"/>
  <xs:element name="StockholdersEquityTablesTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_StockholdersEquityTablesTable"/>
  <xs:element name="AccruedIssuanceCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_AccruedIssuanceCosts"/>
  <xs:element name="AccruedInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_AccruedInterest"/>
  <xs:element name="AccruedBODCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_AccruedBODCompensation"/>
  <xs:element name="FairValueMeasurementsScheduleofChangesintheFairValueofLevel3FinancialAssetsandLiabilitiesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_FairValueMeasurementsScheduleofChangesintheFairValueofLevel3FinancialAssetsandLiabilitiesDetailsTable"/>
  <xs:element name="StockholdersEquityScheduleofWarrantstoPurchaseCommonStockOutstandingDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_StockholdersEquityScheduleofWarrantstoPurchaseCommonStockOutstandingDetailsTable"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInWeightedAverageRemainingContractualTerm"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisedInWeightedAverageRemainingContractualTerm"/>
  <xs:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresExpirationsAndCancelledInWeightedAverageRemainingContractualTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresExpirationsAndCancelledInWeightedAverageRemainingContractualTerm"/>
  <xs:element name="ShareBasedCompensationScheduleofCompanysRestrictedStockUnitActivityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_ShareBasedCompensationScheduleofCompanysRestrictedStockUnitActivityDetailsTable"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardGrantedOutstandingWeightedAverageRemainingContractualTerm2" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SharebasedCompensationArrangementBySharebasedPaymentAwardGrantedOutstandingWeightedAverageRemainingContractualTerm2"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardVestedOutstandingWeightedAverageRemainingContractualTerm2" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SharebasedCompensationArrangementBySharebasedPaymentAwardVestedOutstandingWeightedAverageRemainingContractualTerm2"/>
  <xs:element name="SharebasedCompensationArrangementBySharebasedPaymentAwardForfeitedOutstandingWeightedAverageRemainingContractualTerm2" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SharebasedCompensationArrangementBySharebasedPaymentAwardForfeitedOutstandingWeightedAverageRemainingContractualTerm2"/>
  <xs:element name="StatementOfIncomeLocationDomainDomain" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_StatementOfIncomeLocationDomainDomain"/>
  <xs:element name="OrganizationandDescriptionoftheBusinessDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_OrganizationandDescriptionoftheBusinessDetailsTable"/>
  <xs:element name="ReverseStockSplitSharesOfIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ReverseStockSplitSharesOfIssued"/>
  <xs:element name="ReverseStockSpllitSharesOfOutstanding" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ReverseStockSpllitSharesOfOutstanding"/>
  <xs:element name="GoingConcernTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_GoingConcernTerm"/>
  <xs:element name="ConsecutiveBusinessDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ConsecutiveBusinessDays"/>
  <xs:element name="SecurityBidPricePerShare" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_SecurityBidPricePerShare"/>
  <xs:element name="ReceiptOfAforementionedNotice" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ReceiptOfAforementionedNotice"/>
  <xs:element name="SummaryofSignificantAccountingPoliciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_SummaryofSignificantAccountingPoliciesDetailsTable"/>
  <xs:element name="LicenseandCollaborationAgreementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_LicenseandCollaborationAgreementsDetailsTable"/>
  <xs:element name="AgreementInitialTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_AgreementInitialTerm"/>
  <xs:element name="MilestonePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_MilestonePayments"/>
  <xs:element name="NonRefundablePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_NonRefundablePayments"/>
  <xs:element name="OriginalCelltrionAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_OriginalCelltrionAgreement"/>
  <xs:element name="PercentageOfOriginalCelltrionAgreement" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfOriginalCelltrionAgreement"/>
  <xs:element name="PercentageOfAmendedCelltrionAgreement" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfAmendedCelltrionAgreement"/>
  <xs:element name="PercentageOfReimbursement" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfReimbursement"/>
  <xs:element name="CommitmentsunderResearchandCollaborationAgreementsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_CommitmentsunderResearchandCollaborationAgreementsDetailsTable"/>
  <xs:element name="ClinicalDevelopmentMilestones" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_ClinicalDevelopmentMilestones"/>
  <xs:element name="RegulatoryEvents" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_RegulatoryEvents"/>
  <xs:element name="CommercialSales" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_CommercialSales"/>
  <xs:element name="MilestonePaymentsCommercialMilestones" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_MilestonePaymentsCommercialMilestones"/>
  <xs:element name="PaymentForExtensionRoyalities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_PaymentForExtensionRoyalities"/>
  <xs:element name="DevelopmentMilestones" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_DevelopmentMilestones"/>
  <xs:element name="AnnualSalesMilestonePayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_AnnualSalesMilestonePayments"/>
  <xs:element name="NetProfitsFromLicensedProductSales" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NetProfitsFromLicensedProductSales"/>
  <xs:element name="MilestonePaymentsUponAchievingRDAndCommercializationEvents" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_MilestonePaymentsUponAchievingRDAndCommercializationEvents"/>
  <xs:element name="MilestonePaymentOnNetSales" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_MilestonePaymentOnNetSales"/>
  <xs:element name="AccruedToAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_AccruedToAmount"/>
  <xs:element name="PatentCostsReimbursements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_PatentCostsReimbursements"/>
  <xs:element name="CommitmentsandContingenciesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_CommitmentsandContingenciesDetailsTable"/>
  <xs:element name="BusinessDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_BusinessDays"/>
  <xs:element name="MonthlyInstallmentPayments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_MonthlyInstallmentPayments"/>
  <xs:element name="RemainingLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_RemainingLiability"/>
  <xs:element name="EscrowPayment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_EscrowPayment"/>
  <xs:element name="ExciseTaxLiability" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ExciseTaxLiability"/>
  <xs:element name="ExciseTaxGenerallyOfTheFairMarketValuePercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ExciseTaxGenerallyOfTheFairMarketValuePercentage"/>
  <xs:element name="PercentageOfUnderpaymentPenaltyPerMonth" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfUnderpaymentPenaltyPerMonth"/>
  <xs:element name="PercentageOfLiabilityTotal" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfLiabilityTotal"/>
  <xs:element name="InterestAndPenalties" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_InterestAndPenalties"/>
  <xs:element name="ExcessTaxes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ExcessTaxes"/>
  <xs:element name="MergerEarnout" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_MergerEarnout"/>
  <xs:element name="ForwardPurchaseAgreementDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_ForwardPurchaseAgreementDetailsTable"/>
  <xs:element name="DerivativeChangeInFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_DerivativeChangeInFairValue"/>
  <xs:element name="DebtInstrumentInterestRateTermDomainDomain" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_DebtInstrumentInterestRateTermDomainDomain"/>
  <xs:element name="WarrantsExercisableDateDomainDomain" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_WarrantsExercisableDateDomainDomain"/>
  <xs:element name="NotesPayableDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_NotesPayableDetailsTable"/>
  <xs:element name="ConversionOfConsiderationUnderPromissoryNoteAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_ConversionOfConsiderationUnderPromissoryNoteAgreement"/>
  <xs:element name="IncentiveSharesReceivedBySubsidiary" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_IncentiveSharesReceivedBySubsidiary"/>
  <xs:element name="AdditionalInterestExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item" id="abp_AdditionalInterestExpense"/>
  <xs:element name="StandbyEquityPurchaseAgreementDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_StandbyEquityPurchaseAgreementDetailsTable"/>
  <xs:element name="StandbyEquityPurchaseAgreementDetailsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_StandbyEquityPurchaseAgreementDetailsLineItems"/>
  <xs:element name="ExcessOfCommonStockPercentage" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_ExcessOfCommonStockPercentage"/>
  <xs:element name="PercentageOfVolumeWeightedAveragePrice" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfVolumeWeightedAveragePrice"/>
  <xs:element name="ConvertibleThresholdConsecutiveTradingDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_ConvertibleThresholdConsecutiveTradingDays"/>
  <xs:element name="PercentageOfClosingPrice" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfClosingPrice"/>
  <xs:element name="FloorPrice" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_FloorPrice"/>
  <xs:element name="NumberOfTradingDays" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NumberOfTradingDays"/>
  <xs:element name="VolumeWeightedAveragePrice" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_VolumeWeightedAveragePrice"/>
  <xs:element name="PercentageOfCommonStock" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfCommonStock"/>
  <xs:element name="PercentageOfAmortizationPrincipalAmount" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfAmortizationPrincipalAmount"/>
  <xs:element name="PercentageOfCommonStockOutstanding" type="dtr:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfCommonStockOutstanding"/>
  <xs:element name="PercentageOfAdvanceNotice" type="dtr:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PercentageOfAdvanceNotice"/>
  <xs:element name="StockholdersEquityDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_StockholdersEquityDetailsTable"/>
  <xs:element name="WarrantsExercisableTerm" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_WarrantsExercisableTerm"/>
  <xs:element name="ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_ClassOfWarrantOrRightRedemptionPriceOfWarrantsOrRights"/>
  <xs:element name="ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_ClassOfWarrantOrRightRedemptionOfWarrantsOrRightsStockPriceTrigger"/>
  <xs:element name="NumberOfTradingDaysForDeterminingTheSharePrice" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NumberOfTradingDaysForDeterminingTheSharePrice"/>
  <xs:element name="PeriodAfterWhichTheWarrantsAreExercisable" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PeriodAfterWhichTheWarrantsAreExercisable"/>
  <xs:element name="PerShareRedemptionsTriggerPrice" type="dtr:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item" id="abp_PerShareRedemptionsTriggerPrice"/>
  <xs:element name="ShareBasedCompensationDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_ShareBasedCompensationDetailsTable"/>
  <xs:element name="RelatedPartiesDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_RelatedPartiesDetailsTable"/>
  <xs:element name="AnnualCompensation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_AnnualCompensation"/>
  <xs:element name="UnpaidAmount" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item" id="abp_UnpaidAmount"/>
  <xs:element name="SubsequentEventsDetailsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem" id="abp_SubsequentEventsDetailsTable"/>
  <xs:element name="DebtInstrumentInterestRateTermAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="abp_DebtInstrumentInterestRateTermAxis"/>
  <xs:element name="StatementOfIncomeLocationAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="abp_StatementOfIncomeLocationAxis"/>
  <xs:element name="WarrantsExercisableDateAxis" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:dimensionItem" id="abp_WarrantsExercisableDateAxis"/>
  <xs:element name="ABIMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ABIMember"/>
  <xs:element name="ABP201CollaborationAndLicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ABP201CollaborationAndLicenseAgreementMember"/>
  <xs:element name="AbproBioInternationalIncMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_AbproBioInternationalIncMember"/>
  <xs:element name="AfterMaturityDateMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_AfterMaturityDateMember"/>
  <xs:element name="AmendedCelltrionAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_AmendedCelltrionAgreementMember"/>
  <xs:element name="CEOConsultingAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_CEOConsultingAgreementMember"/>
  <xs:element name="CROVendorMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_CROVendorMember"/>
  <xs:element name="CelltrionCollaborationAndLicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_CelltrionCollaborationAndLicenseAgreementMember"/>
  <xs:element name="CommonStock00001ParValuePerShareMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_CommonStock00001ParValuePerShareMember"/>
  <xs:element name="ConvertibleNotesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ConvertibleNotesMember"/>
  <xs:element name="ConvertiblePreferredStocksMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ConvertiblePreferredStocksMember"/>
  <xs:element name="ConvertiblePromissoryNoteMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ConvertiblePromissoryNoteMember"/>
  <xs:element name="ExchangeCapEventMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ExchangeCapEventMember"/>
  <xs:element name="ExecutiveMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ExecutiveMember"/>
  <xs:element name="ExecutiveWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ExecutiveWarrantsMember"/>
  <xs:element name="FirstConvertibleNoteMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_FirstConvertibleNoteMember"/>
  <xs:element name="FirstMilestoneMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_FirstMilestoneMember"/>
  <xs:element name="FloorPriceEventMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_FloorPriceEventMember"/>
  <xs:element name="ForwardPurchaseAgreementAssetMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ForwardPurchaseAgreementAssetMember"/>
  <xs:element name="ForwardPurchaseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ForwardPurchaseAgreementMember"/>
  <xs:element name="FundingDateToMaturityDateMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_FundingDateToMaturityDateMember"/>
  <xs:element name="GeneralAndAdministrativeMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_GeneralAndAdministrativeMember"/>
  <xs:element name="IssuanceDateOfWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_IssuanceDateOfWarrantsMember"/>
  <xs:element name="LegacyAbproCommonStockWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_LegacyAbproCommonStockWarrantsMember"/>
  <xs:element name="MSKLicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_MSKLicenseAgreementMember"/>
  <xs:element name="MedImmuneLicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_MedImmuneLicenseAgreementMember"/>
  <xs:element name="NCILicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NCILicenseAgreementMember"/>
  <xs:element name="NJCTTQCollaborationAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NJCTTQCollaborationAgreementMember"/>
  <xs:element name="NonRedemptionAgreementsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NonRedemptionAgreementsMember"/>
  <xs:element name="NotePayableMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NotePayableMember"/>
  <xs:element name="NumberOfSharesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_NumberOfSharesMember"/>
  <xs:element name="OneYearAnniversaryOfIssuanceDateOfWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_OneYearAnniversaryOfIssuanceDateOfWarrantsMember"/>
  <xs:element name="OriginalCelltrionAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_OriginalCelltrionAgreementMember"/>
  <xs:element name="OtherAccruedExpensesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_OtherAccruedExpensesMember"/>
  <xs:element name="PrivatePlacementWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PrivatePlacementWarrantsMember"/>
  <xs:element name="PromissoryNoteMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PromissoryNoteMember"/>
  <xs:element name="PromissoryNoteWithABIMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PromissoryNoteWithABIMember"/>
  <xs:element name="PromissoryNotesWithExecutiveAndDirectorMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PromissoryNotesWithExecutiveAndDirectorMember"/>
  <xs:element name="PublicWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_PublicWarrantsMember"/>
  <xs:element name="RedemptionTriggerMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_RedemptionTriggerMember"/>
  <xs:element name="RegistrationEventMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_RegistrationEventMember"/>
  <xs:element name="ResearchAndDevelopmentServicesMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ResearchAndDevelopmentServicesMember"/>
  <xs:element name="ReverseStockSplitMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_ReverseStockSplitMember"/>
  <xs:element name="SEPAMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SEPAMember"/>
  <xs:element name="SEPAPutRightsAssetMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SEPAPutRightsAssetMember"/>
  <xs:element name="SecondConvertibleNoteMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SecondConvertibleNoteMember"/>
  <xs:element name="SeriesACommonStockMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SeriesACommonStockMember"/>
  <xs:element name="SettlementAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_SettlementAgreementMember"/>
  <xs:element name="StockOptionsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_StockOptionsMember"/>
  <xs:element name="TwoYearAnniversaryOfIssuanceDateOfWarrantsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_TwoYearAnniversaryOfIssuanceDateOfWarrantsMember"/>
  <xs:element name="TwoZeroOneFourStockIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_TwoZeroOneFourStockIncentivePlanMember"/>
  <xs:element name="TwoZeroTwoFourEquityIncentivePlanMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_TwoZeroTwoFourEquityIncentivePlanMember"/>
  <xs:element name="UnvestedRestrictedStockUnitsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_UnvestedRestrictedStockUnitsMember"/>
  <xs:element name="VAZYMELicenseAgreementMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_VAZYMELicenseAgreementMember"/>
  <xs:element name="VAZYMEMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_VAZYMEMember"/>
  <xs:element name="VendorsMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_VendorsMember"/>
  <xs:element name="WarrantsToPurchaseCommonStockMember" type="dtr:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_WarrantsToPurchaseCommonStockMember"/>
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  <xs:element name="DocumentAndEntityInformationAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item" id="abp_DocumentAndEntityInformationAbstract"/>
</xs:schema>
