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  <xs:element id="gern_ScheduleOfActivityWithinLiabilityRelatedToSaleOfFutureRoyaltiesTableTextBlock" abstract="false" name="ScheduleOfActivityWithinLiabilityRelatedToSaleOfFutureRoyaltiesTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="gern_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" abstract="false" name="ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="gern_RevenuesBeforeAdjustmentsMember" abstract="true" name="RevenuesBeforeAdjustmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ChargebacksMember" abstract="true" name="ChargebacksMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_DistributorServiceFeesMember" abstract="true" name="DistributorServiceFeesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_GovernmentRebatesMember" abstract="true" name="GovernmentRebatesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_SalesReturnsAndAllowanceMember" abstract="true" name="SalesReturnsAndAllowanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TotalGrossToNetAdjustmentsMember" abstract="true" name="TotalGrossToNetAdjustmentsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CustomerOneMember" abstract="true" name="CustomerOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CustomerTwoMember" abstract="true" name="CustomerTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CustomerThreeMember" abstract="true" name="CustomerThreeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_USTreasurySecuritiesDueInLessThanOneYearMember" abstract="true" name="USTreasurySecuritiesDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_USTreasurySecuritiesDueInOneToTwoYearsMember" abstract="true" name="USTreasurySecuritiesDueInOneToTwoYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_MunicipalSecuritiesDueInLessThanOneYearMember" abstract="true" name="MunicipalSecuritiesDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember" abstract="true" name="USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CommercialPaperDueInLessThanOneYearMember" abstract="true" name="CommercialPaperDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CorporateNoteSecuritiesDueInLessThanOneYearMember" abstract="true" name="CorporateNoteSecuritiesDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember" abstract="true" name="CorporateNoteSecuritiesDueInOneToTwoYearsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CashAndCashEquivalentsUnrealizedGains" abstract="false" name="CashAndCashEquivalentsUnrealizedGains" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_CashAndCashEquivalentsUnrealizedLosses" abstract="false" name="CashAndCashEquivalentsUnrealizedLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="gern_RestrictedCashAndCashEquivalentsGrossUnrealizedLosses" abstract="false" name="RestrictedCashAndCashEquivalentsGrossUnrealizedLosses" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_GovernmentSponsoredEnterpriseSecuritiesDueInLessThanOneYearMember" abstract="true" name="GovernmentSponsoredEnterpriseSecuritiesDueInLessThanOneYearMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CashAndCashEquivalentsAndRestrictedCashFairValueDisclosure" abstract="false" name="CashAndCashEquivalentsAndRestrictedCashFairValueDisclosure" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_FairValueMeasurementsInterTransfersBetweenLevels" abstract="false" name="FairValueMeasurementsInterTransfersBetweenLevels" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_AccruedClinicalResearchOrganizationsAndClinicalTrialCostsCurrent" abstract="false" name="AccruedClinicalResearchOrganizationsAndClinicalTrialCostsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_AccruedManufacturingActivitiesCurrent" abstract="false" name="AccruedManufacturingActivitiesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_AccruedRevenueAdjustmentsCurrent" abstract="false" name="AccruedRevenueAdjustmentsCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
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  <xs:element id="gern_EmployeesAboveTheVicePresidentLevelMember" abstract="true" name="EmployeesAboveTheVicePresidentLevelMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_SeverancePlanLineItems" abstract="true" name="SeverancePlanLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_NumberOfSeverancePlan" abstract="false" name="NumberOfSeverancePlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gern_LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod" abstract="false" name="LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity" abstract="false" name="LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlWithinWhichEmployeeResignsDueToMaterialChangeInTermsOfEmployment" abstract="false" name="LossContingencyTriggeringEventPeriodFollowingChangeOfControlWithinWhichEmployeeResignsDueToMaterialChangeInTermsOfEmployment" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_LossContingencyPeriodOfCurrentBaseSalaryToBePaidUnderSeverancePlan" abstract="false" name="LossContingencyPeriodOfCurrentBaseSalaryToBePaidUnderSeverancePlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_LossContingencyPeriodOfCurrentBaseSalaryToBePaidUnderSeverancePlanNonChangeOfControlTriggeringEvent" abstract="false" name="LossContingencyPeriodOfCurrentBaseSalaryToBePaidUnderSeverancePlanNonChangeOfControlTriggeringEvent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
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  <xs:element id="gern_NewJerseyOfficeSpaceLeaseMember" abstract="true" name="NewJerseyOfficeSpaceLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_FosterCityOfficeSpaceLeaseMember" abstract="true" name="FosterCityOfficeSpaceLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_OperatingLeaseRentAbatementPeriod" abstract="false" name="OperatingLeaseRentAbatementPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_NewJerseyLeaseAndFosterCityLeaseMember" abstract="true" name="NewJerseyLeaseAndFosterCityLeaseMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_HerculesAndSiliconValleyBankMember" abstract="true" name="HerculesAndSiliconValleyBankMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_PrepaidPriorToThirdAnniversaryOfFundingDateMember" abstract="true" name="PrepaidPriorToThirdAnniversaryOfFundingDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_PrepaidOnOrAfterThirdAnniversaryButPriorToFourthAnniversaryOfFundingDateMember" abstract="true" name="PrepaidOnOrAfterThirdAnniversaryButPriorToFourthAnniversaryOfFundingDateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="gern_TrancheAMember" abstract="true" name="TrancheAMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TrancheBMember" abstract="true" name="TrancheBMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TrancheCMember" abstract="true" name="TrancheCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TermLoansMember" abstract="true" name="TermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_HerculesLoanAgreementMember" abstract="true" name="HerculesLoanAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_PharmakonLoanAgreementMember" abstract="true" name="PharmakonLoanAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_RoyaltyPharmaRevenueParticipationRightPurchaseAgreementMember" abstract="true" name="RoyaltyPharmaRevenueParticipationRightPurchaseAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_BiopharmaCreditPlcMember" abstract="true" name="BiopharmaCreditPlcMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_DebtInstrumentScenarioAxis" abstract="true" name="DebtInstrumentScenarioAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="gern_DebtInstrumentScenarioDomain" abstract="true" name="DebtInstrumentScenarioDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ScenarioOneMember" abstract="true" name="ScenarioOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ScenarioTwoMember" abstract="true" name="ScenarioTwoMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_DebtInstrumentFloorRate" abstract="false" name="DebtInstrumentFloorRate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_PercentageOfCommitmentAmountToFundLoan" abstract="false" name="PercentageOfCommitmentAmountToFundLoan" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_PrepaymentPremiumOnPercentageOfTermLoan" abstract="false" name="PrepaymentPremiumOnPercentageOfTermLoan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_UpfrontPaymentReceived" abstract="false" name="UpfrontPaymentReceived" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_PercentageOfAnnualNetSales" abstract="false" name="PercentageOfAnnualNetSales" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_DebtInstrumentRoyaltyPaymentRatio" abstract="false" name="DebtInstrumentRoyaltyPaymentRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gern_RoyaltiesRollForward" abstract="true" name="RoyaltiesRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_PublicOfferingTable" abstract="true" name="PublicOfferingTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="gern_TwoThousandTwentyThreeUnderwrittenPublicOfferingMember" abstract="true" name="TwoThousandTwentyThreeUnderwrittenPublicOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandTwentyFourUnderwrittenPublicOfferingMember" abstract="true" name="TwoThousandTwentyFourUnderwrittenPublicOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandTwentyPublicOfferingOfCommonStockAndWarrantsMember" abstract="true" name="TwoThousandTwentyPublicOfferingOfCommonStockAndWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandTwentyThreePreFundedWarrantMember" abstract="true" name="TwoThousandTwentyThreePreFundedWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandTwentyFourPreFundedWarrantMember" abstract="true" name="TwoThousandTwentyFourPreFundedWarrantMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_PreFundedWarrantsMember" abstract="true" name="PreFundedWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_PublicOfferingLineItems" abstract="true" name="PublicOfferingLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_ShareOfCommonStockIssuedDuringPeriodSharesNewIssuesPublicOffering" abstract="false" name="ShareOfCommonStockIssuedDuringPeriodSharesNewIssuesPublicOffering" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_ClassOfWarrantOrRightExercised" abstract="false" name="ClassOfWarrantOrRightExercised" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_TwoThousandTwentyFiveUnderwrittenPublicOfferingMember" abstract="true" name="TwoThousandTwentyFiveUnderwrittenPublicOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
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  <xs:element id="gern_StockPurchaseWarrantsMember" abstract="true" name="StockPurchaseWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandTwentyStockPurchaseWarrantsMember" abstract="true" name="TwoThousandTwentyStockPurchaseWarrantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercised" abstract="false" name="ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRightsExercised" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_AtMarketIssuanceSalesAgreementsTable" abstract="true" name="AtMarketIssuanceSalesAgreementsTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="gern_AtMarketIssuanceTwoThousandAndTwentyThreeSalesAgreementMember" abstract="true" name="AtMarketIssuanceTwoThousandAndTwentyThreeSalesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_AtMarketIssuanceSalesAgreementsLineItems" abstract="true" name="AtMarketIssuanceSalesAgreementsLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_CommonStockAggregateOfferingPrice" abstract="false" name="CommonStockAggregateOfferingPrice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_MaximumCommissionRate" abstract="false" name="MaximumCommissionRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_IncentiveAwardPlan2011Member" abstract="true" name="IncentiveAwardPlan2011Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandAndEighteenEquityIncentivePlanMember" abstract="true" name="TwoThousandAndEighteenEquityIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TwoThousandAndEighteenInducementAwardPlanMember" abstract="true" name="TwoThousandAndEighteenInducementAwardPlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_DirectorsMarketValueStockPurchasePlanMember" abstract="true" name="DirectorsMarketValueStockPurchasePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_FirstDirectorOptionMember" abstract="true" name="FirstDirectorOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_SubsequentDirectorOptionMember" abstract="true" name="SubsequentDirectorOptionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumPercentageOfOwnershipRequiredForGrantingOptionsAtMinimum110PercentOfFairMarketValue" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumPercentageOfOwnershipRequiredForGrantingOptionsAtMinimum110PercentOfFairMarketValue" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceOfOptionsGrantedToEmployeesWithMoreThan10PercentageOfCommonStock" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceOfOptionsGrantedToEmployeesWithMoreThan10PercentageOfCommonStock" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" abstract="false" name="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseSharesUponAppointment" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseSharesUponAppointment" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseShares" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseShares" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesIssuedUnderPlan" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesIssuedUnderPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_ConsultantsMember" abstract="true" name="ConsultantsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ServiceBasedOptionsMember" abstract="true" name="ServiceBasedOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualLifeAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualLifeAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" abstract="true" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDurationOfOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDurationOfOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfPurchasePeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfPurchasePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountOfAnnualSalaryThatCanBeWithheldPerYear" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAmountOfAnnualSalaryThatCanBeWithheldPerYear" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfNewOfferingPeriod" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfNewOfferingPeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndNonOptionEquityInstrumentsOutstandingNumber" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndNonOptionEquityInstrumentsOutstandingNumber" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlans" abstract="false" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEmployeeStockPurchasePlans" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gern_EffectiveIncomeTaxRateReconciliationShareBasedPaymentArrangementLimitAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationShareBasedPaymentArrangementLimitAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_EffectiveIncomeTaxRateReconciliationNetOperatingLossNotBenefittedAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationNetOperatingLossNotBenefittedAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_EffectiveIncomeTaxRateReconciliationShareBasedPaymentArrangementLimitPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationShareBasedPaymentArrangementLimitPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gern_EffectiveIncomeTaxRateReconciliationNetOperatingLossNotBenefittedPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNetOperatingLossNotBenefittedPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gern_DeferredTaxAssetsFederalAndStateCredits" abstract="false" name="DeferredTaxAssetsFederalAndStateCredits" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_DeferredTaxAssetsCapitalizedResearchAndDevelopment" abstract="false" name="DeferredTaxAssetsCapitalizedResearchAndDevelopment" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_DeferredTaxAssetsRevenueParticipation" abstract="false" name="DeferredTaxAssetsRevenueParticipation" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_DeferredTaxAssetsOperatingLeaseLiabilities" abstract="false" name="DeferredTaxAssetsOperatingLeaseLiabilities" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_DeferredTaxLiabilitiesOperatingLeasesRightOfUseAssets" abstract="false" name="DeferredTaxLiabilitiesOperatingLeasesRightOfUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_OperatingLossCarryforwardsSubjectToExpiration" abstract="false" name="OperatingLossCarryforwardsSubjectToExpiration" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_ReclassificationBetweenPrepaidAndOtherCurrentAssetsAndDepositsAndOtherAssets" abstract="false" name="ReclassificationBetweenPrepaidAndOtherCurrentAssetsAndDepositsAndOtherAssets" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_ReportableSegmentMember" abstract="true" name="ReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ResearchAndClinicalExpensesMember" abstract="true" name="ResearchAndClinicalExpensesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_ChemistryManufacturingAndControlExpensesMember" abstract="true" name="ChemistryManufacturingAndControlExpensesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_CommercialExpensesMember" abstract="true" name="CommercialExpensesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_A2026SalesAgreementMember" abstract="true" name="A2026SalesAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_TDSecuritiesUSALLCMember" abstract="true" name="TDSecuritiesUSALLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gern_SaleOfStockAggregateOfferingPrice" abstract="false" name="SaleOfStockAggregateOfferingPrice" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gern_SaleOfStockAggregateCommissionPercentage" abstract="false" name="SaleOfStockAggregateCommissionPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
</xs:schema>
