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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_MeasurementInputProbabilityOfCallOptionAndForwardContractMember" abstract="true" name="MeasurementInputProbabilityOfCallOptionAndForwardContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ScheduleOfReverseRecapitalizationTableTextBlock" abstract="false" name="ScheduleOfReverseRecapitalizationTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInAuthorizedSharesPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInAuthorizedSharesPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_CashCashEquivalentsRestrictedCashAndDebtSecuritiesAvailableForSaleFairValue" abstract="false" name="CashCashEquivalentsRestrictedCashAndDebtSecuritiesAvailableForSaleFairValue" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExercisableWeightedAverageRemainingContractualTerm" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExercisableWeightedAverageRemainingContractualTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityShares" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_MeasurementInputValueOfEachTrancheFeatureMember" abstract="true" name="MeasurementInputValueOfEachTrancheFeatureMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ReverseRecapitalizationAccruedTransactionCosts" abstract="false" name="ReverseRecapitalizationAccruedTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_A2022InducementEquityPlanMember" abstract="true" name="A2022InducementEquityPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_AlamedaMember" abstract="true" name="AlamedaMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_PostDecember312017Member" abstract="true" name="PostDecember312017Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityNumberOfTranches" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityNumberOfTranches" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_SmallEquipmentMember" abstract="true" name="SmallEquipmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingWeightedAverageExercisePrice" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_MergerAndRelatedPIPEFinancingCostsIncurredButNotYetPaid" abstract="false" name="MergerAndRelatedPIPEFinancingCostsIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" 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-types:domainItemType"/>
  <xs:element id="snti_ReceivablesInTransitFromIssuanceOfCommonStockUponExerciseOfStockOptions" abstract="false" name="ReceivablesInTransitFromIssuanceOfCommonStockUponExerciseOfStockOptions" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_PreferredStockTrancheLiabilityMember" abstract="true" name="PreferredStockTrancheLiabilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_TemporaryEquitySharesConversionOfConvertibleSecurities" abstract="false" name="TemporaryEquitySharesConversionOfConvertibleSecurities" 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-types:domainItemType"/>
  <xs:element id="snti_SaleOfStockDocumentPreparationFees" abstract="false" name="SaleOfStockDocumentPreparationFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_SparkMember" abstract="true" name="SparkMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ReverseRecapitalizationTable" abstract="true" name="ReverseRecapitalizationTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePricePercentageOfFairMarketValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardExercisePricePercentageOfFairMarketValue" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_EarlyExerciseLiabilityCurrent" abstract="false" name="EarlyExerciseLiabilityCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_OperatingLeaseProceedsPayments" abstract="false" name="OperatingLeaseProceedsPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_EarlyExerciseOfStockOptionsValue" abstract="false" name="EarlyExerciseOfStockOptionsValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdTradingDays" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_UnvestedEarlyExercisedOptionsMember" abstract="true" name="UnvestedEarlyExercisedOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_StockConvertedReverseRecapitalization" abstract="false" name="StockConvertedReverseRecapitalization" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_MarketAwardsMember" abstract="true" name="MarketAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_WeightedAverageFairValueMember" abstract="true" name="WeightedAverageFairValueMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ContingentConsiderationTrancheTwoMember" abstract="true" name="ContingentConsiderationTrancheTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExercisableWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVestedAndExercisableWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingRightsNumberOfTranches" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_StockIssuedDuringPeriodSharesCancellationAndExchangeOfConvertibleDebt" abstract="false" name="StockIssuedDuringPeriodSharesCancellationAndExchangeOfConvertibleDebt" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_SignificantUnobservableInputsPreferredStockTrancheLiabilityTableTextBlock" abstract="false" name="SignificantUnobservableInputsPreferredStockTrancheLiabilityTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityTerm" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_CustomerAMember" abstract="true" name="CustomerAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodSharesVestingOfEarlyExerciseOfStockOptions" abstract="false" name="StockIssuedDuringPeriodSharesVestingOfEarlyExerciseOfStockOptions" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_RecognitionOfPreferredStockTrancheLiability" abstract="false" name="RecognitionOfPreferredStockTrancheLiability" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriod" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_NumberOfVotesPerCommonShare" abstract="false" name="NumberOfVotesPerCommonShare" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_ReverseRecapitalizationLineItems" abstract="true" name="ReverseRecapitalizationLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="snti_TenantImprovementAllowanceRemainingAmount" abstract="false" name="TenantImprovementAllowanceRemainingAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ResearchAndDevelopmentExpenseTermOfAgreement" abstract="false" name="ResearchAndDevelopmentExpenseTermOfAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset" abstract="false" name="DeferredTaxLiabilitiesOperatingLeaseRightOfUseAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardStockholderOwnershipPercentage" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardStockholderOwnershipPercentage" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_RevenueFromAndNotFromContractsTextBlock" abstract="false" name="RevenueFromAndNotFromContractsTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_RevenueRemainingPerformanceObligationVariableConsiderationAmount" abstract="false" name="RevenueRemainingPerformanceObligationVariableConsiderationAmount" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_CollaborativeArrangementRightsAndObligationsContractualAnnualPayments" abstract="false" name="CollaborativeArrangementRightsAndObligationsContractualAnnualPayments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_DeferredTaxAssetsLeaseLiability" abstract="false" name="DeferredTaxAssetsLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_SaleOfStockNumberOfSharesIssuedInTransactionThreshold" abstract="false" name="SaleOfStockNumberOfSharesIssuedInTransactionThreshold" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_SeriesAAndBRedeemableConvertiblePreferredStockMember" abstract="true" name="SeriesAAndBRedeemableConvertiblePreferredStockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_AccruedProfessionalFeesOtherCurrent" abstract="false" name="AccruedProfessionalFeesOtherCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <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_ReverseRecapitalizationTransactionCosts" abstract="false" name="ReverseRecapitalizationTransactionCosts" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_BlueRockMember" abstract="true" name="BlueRockMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_OperatingLossCarryforwardsAndTaxCreditCarryforwardsTable" abstract="true" name="OperatingLossCarryforwardsAndTaxCreditCarryforwardsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="snti_CaseDomain" abstract="true" name="CaseDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_CorporateHeadquartersMember" abstract="true" name="CorporateHeadquartersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types: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_RevenueFromContractWithCustomerTerminationNoticePeriod" abstract="false" name="RevenueFromContractWithCustomerTerminationNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_SaleOfStockTermOfAgreement" abstract="false" name="SaleOfStockTermOfAgreement" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGrantsInPeriodWeightedAverageExercisePrice" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_BusinessCombinationContingentConsiderationClassifiedAsEquityMeasurementInput" abstract="false" name="BusinessCombinationContingentConsiderationClassifiedAsEquityMeasurementInput" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:decimalItemType"/>
  <xs:element id="snti_SaleOfStockSharesIssuedInTransactionThresholdPercent" abstract="false" name="SaleOfStockSharesIssuedInTransactionThresholdPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_RedeemableConvertiblePreferredStockSeriesAMember" abstract="true" name="RedeemableConvertiblePreferredStockSeriesAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_NumberOfSeatsOnTheBoardOfDirectors" abstract="false" name="NumberOfSeatsOnTheBoardOfDirectors" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="snti_MeasurementInputTimeToLiquidityMember" abstract="true" name="MeasurementInputTimeToLiquidityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_CaseAxis" abstract="true" name="CaseAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="snti_ComputerEquipmentAndSoftwareMember" abstract="true" name="ComputerEquipmentAndSoftwareMember" 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_ScheduleOfSharesReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfSharesReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdConsecutiveTradingDays" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodThresholdConsecutiveTradingDays" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_May2022NoteMember" abstract="true" name="May2022NoteMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_CommonStockPurchaseAgreementMember" abstract="true" name="CommonStockPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_RevenueFromContractWithCustomerEvaluationPeriod" abstract="false" name="RevenueFromContractWithCustomerEvaluationPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="snti_StockIssuedForPurchaseAgreementFee" abstract="false" name="StockIssuedForPurchaseAgreementFee" 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_DeferredOfferingCostsExpensed" abstract="false" name="DeferredOfferingCostsExpensed" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_TrancheDomain" abstract="true" name="TrancheDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_ContingentEarnoutEquityPolicyTextBlock" abstract="false" name="ContingentEarnoutEquityPolicyTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_WeightedFairValueOfTrancheFeature" abstract="false" name="WeightedFairValueOfTrancheFeature" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_TenantImprovementReimbursements" abstract="false" name="TenantImprovementReimbursements" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_StockIssuedDuringPeriodSharesPurchaseAgreementFeeSettledInStock" abstract="false" name="StockIssuedDuringPeriodSharesPurchaseAgreementFeeSettledInStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="snti_NumberOfBusinessActivities" abstract="false" name="NumberOfBusinessActivities" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <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_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInSharesAuthorizedPercentageOfOutstandingShares" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInSharesAuthorizedPercentageOfOutstandingShares" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_ReverseRecapitalizationTransactionCostsIncurredByCompany" abstract="false" name="ReverseRecapitalizationTransactionCostsIncurredByCompany" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_TrancheTwoAndThreeForwardContractMember" abstract="true" name="TrancheTwoAndThreeForwardContractMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_OperatingLossCarryforwardsAndTaxCreditCarryforwardsLineItems" abstract="true" name="OperatingLossCarryforwardsAndTaxCreditCarryforwardsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="snti_BayerMember" abstract="true" name="BayerMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="snti_SaleOfStockDiscountRatePercentage" abstract="false" name="SaleOfStockDiscountRatePercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger" abstract="false" name="ReverseRecapitalizationContingentConsiderationEquityEarnoutPeriodStockPriceTrigger" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="snti_SaleOfStockIssuanceCosts" abstract="false" name="SaleOfStockIssuanceCosts" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_DebtInstrumentConversionPricePercent" abstract="false" name="DebtInstrumentConversionPricePercent" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="snti_TenantImprovementAllowance" abstract="false" name="TenantImprovementAllowance" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="snti_ReverseRecapitalizationDisclosureTextBlock" abstract="false" name="ReverseRecapitalizationDisclosureTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="snti_ContractWithCustomerExtensionOfTermModificationOfContract" abstract="false" name="ContractWithCustomerExtensionOfTermModificationOfContract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
</xs:schema>
