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  <xs:element id="snti_AdjustmentsToAdditionalPaidInCapitalContingentConsiderationLiabilityOnClosingOfTheReverseRecapitalization" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalContingentConsiderationLiabilityOnClosingOfTheReverseRecapitalization" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityNetOfAdjustments" abstract="false" name="RightOfUseAssetObtainedInExchangeForOperatingLeaseLiabilityNetOfAdjustments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_SaleOfStockDailyAmountToBeSoldThreshold" abstract="false" name="SaleOfStockDailyAmountToBeSoldThreshold" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationFairValue" abstract="false" name="ReverseRecapitalizationContingentConsiderationFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_EmploymentOfferNumberOfEmployees" abstract="false" name="EmploymentOfferNumberOfEmployees" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_ComputerEquipmentAndSoftwareMember" abstract="true" name="ComputerEquipmentAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_EarningsPerShareBasicAndDilutedEPSAbstract" abstract="true" name="EarningsPerShareBasicAndDilutedEPSAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="snti_CorporateHeadquartersMember" abstract="true" name="CorporateHeadquartersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePricePercentageOfFairMarketValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePricePercentageOfFairMarketValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="snti_GeneFabEconomicShareMember" abstract="true" name="GeneFabEconomicShareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquitySharesPerTranche" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquitySharesPerTranche" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_MeasurementInputEquityValueMember" abstract="true" name="MeasurementInputEquityValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_CashCashEquivalentsRestrictedCashAndDebtSecuritiesAvailableForSaleAmortizedCost" abstract="false" name="CashCashEquivalentsRestrictedCashAndDebtSecuritiesAvailableForSaleAmortizedCost" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ContingentEarnoutLiabilityMember" abstract="true" name="ContingentEarnoutLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_ContingentConsiderationTrancheTwoMember" abstract="true" name="ContingentConsiderationTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types1:perShareItemType"/>
  <xs:element id="snti_ScheduleOfSharesReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfSharesReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:textBlockItemType"/>
  <xs:element id="snti_NumberOfSeatsOnTheBoardOfDirectors" abstract="false" name="NumberOfSeatsOnTheBoardOfDirectors" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodValuePurchaseAgreementFeeSettledInStock" abstract="false" name="StockIssuedDuringPeriodValuePurchaseAgreementFeeSettledInStock" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_CommonStockSubjectToRepurchaseValue" abstract="false" name="CommonStockSubjectToRepurchaseValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockholderOwnershipPercentageThreshold" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardStockholderOwnershipPercentageThreshold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="snti_GeneFabNoteReceivableMember" abstract="true" name="GeneFabNoteReceivableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_SubleaseRentMember" abstract="true" name="SubleaseRentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_LesseeOperatingLeaseNumberOfRenewalOptions" abstract="false" name="LesseeOperatingLeaseNumberOfRenewalOptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_ContingentConsiderationAssetMeasurementInput" abstract="false" name="ContingentConsiderationAssetMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityTerm" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_ProceedsFromMergerAndRelatedPIPEFinancingNetOfTransactionCosts" abstract="false" name="ProceedsFromMergerAndRelatedPIPEFinancingNetOfTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_OptionIndexedToIssuersEquitySharesValue" abstract="false" name="OptionIndexedToIssuersEquitySharesValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_OptionIndexedToIssuersEquityExerciseTerm" abstract="false" name="OptionIndexedToIssuersEquityExerciseTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_ResearchAndDevelopmentArrangementExpectedCosts" abstract="false" name="ResearchAndDevelopmentArrangementExpectedCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_RestrictedCashMember" abstract="true" name="RestrictedCashMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_DisposalGroupIncludingDiscontinuedOperationGeneraAndAdministrativeExpenseNetOfReversals" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationGeneraAndAdministrativeExpenseNetOfReversals" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_AdjustmentsToAdditionalPaidInCapitalGainOnEmbeddedDerivative" abstract="false" name="AdjustmentsToAdditionalPaidInCapitalGainOnEmbeddedDerivative" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ContingentConsiderationTranchesDomain" abstract="true" name="ContingentConsiderationTranchesDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_CustomerBMember" abstract="true" name="CustomerBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_BusinessCombinationContingentConsiderationClassifiedAsEquityMeasurementInput" abstract="false" name="BusinessCombinationContingentConsiderationClassifiedAsEquityMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInSharesAuthorizedPercentageOfOutstandingShares" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInSharesAuthorizedPercentageOfOutstandingShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="snti_RevenueFromContractWithCustomerEvaluationPeriod" abstract="false" name="RevenueFromContractWithCustomerEvaluationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_EarlyExerciseLiabilityNoncurrent" abstract="false" name="EarlyExerciseLiabilityNoncurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_DisposalGroupIncludingDiscontinuedOperationAccruedExpensesAndOtherCurrentLiabilities" abstract="false" name="DisposalGroupIncludingDiscontinuedOperationAccruedExpensesAndOtherCurrentLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_GeneFabOptionMember" abstract="true" name="GeneFabOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodSharesCancellationAndExchangeOfConvertibleDebt" abstract="false" name="StockIssuedDuringPeriodSharesCancellationAndExchangeOfConvertibleDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_NEAMember" abstract="true" name="NEAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_May2022NoteMember" abstract="true" name="May2022NoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExercisableWeightedAverageRemainingContractualTerm" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExercisableWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodValueVestingOfEarlyExerciseOfStockOptions" abstract="false" name="StockIssuedDuringPeriodValueVestingOfEarlyExerciseOfStockOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_TenantImprovementAllowanceUtilized" abstract="false" name="TenantImprovementAllowanceUtilized" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_NumberOfVotesPerCommonShare" abstract="false" name="NumberOfVotesPerCommonShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_ContingentEarnoutCommonStockMember" abstract="true" name="ContingentEarnoutCommonStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_IncreaseDecreaseInDeferredSubleaseIncome" abstract="false" name="IncreaseDecreaseInDeferredSubleaseIncome" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_TemporaryEquitySharesConversionOfConvertibleSecurities" abstract="false" name="TemporaryEquitySharesConversionOfConvertibleSecurities" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_ContractWithCustomerExtensionOfTermModificationOfContract" abstract="false" name="ContractWithCustomerExtensionOfTermModificationOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodValueCancellationAndExchangeOfConvertibleDebt" abstract="false" name="StockIssuedDuringPeriodValueCancellationAndExchangeOfConvertibleDebt" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_TemporaryEquityValueConversionOfConvertibleSecurities" abstract="false" name="TemporaryEquityValueConversionOfConvertibleSecurities" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_BayerMember" abstract="true" name="BayerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_CommonStockPurchaseAgreementMember" abstract="true" name="CommonStockPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInAuthorizedSharesPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInAuthorizedSharesPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="snti_AlamedaMember" abstract="true" name="AlamedaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_MarketAwardsMember" abstract="true" name="MarketAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
  <xs:element id="snti_SaleOfStockDailyTradingVolumeAvailableForPurchaseThresholdPercent" abstract="false" name="SaleOfStockDailyTradingVolumeAvailableForPurchaseThresholdPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:percentItemType"/>
  <xs:element id="snti_BlueRockMember" abstract="true" name="BlueRockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types1:domainItemType"/>
</xs:schema>
