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  <xsd:element name="DeferredTaxAssetsCapitalizedLicenseFees" id="gern_DeferredTaxAssetsCapitalizedLicenseFees" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
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  <xsd:element name="DefinedContributionPlanAcceleratedVestingAmountInUnvestedPriorEmployerMatchesForEmployeesAffectedByRestructuring" id="gern_DefinedContributionPlanAcceleratedVestingAmountInUnvestedPriorEmployerMatchesForEmployeesAffectedByRestructuring" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element name="DirectorsStockOptionPlan1996Member" id="gern_DirectorsStockOptionPlan1996Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesAndIssuances" id="gern_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesAndIssuances" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
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  <xsd:element name="GEHealthcareUKLimitedMember" id="gern_GEHealthcareUKLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="GeronBioMedLtdMember" id="gern_GeronBioMedLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="IncreaseDecreaseInAccruedInterestReceivableNetAndOtherReceivables" id="gern_IncreaseDecreaseInAccruedInterestReceivableNetAndOtherReceivables" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="IncrementalAcquiredInProcessResearchAndDevelopmentExpense" id="gern_IncrementalAcquiredInProcessResearchAndDevelopmentExpense" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="IssuanceOfStockAndOptionsSharesServices" id="gern_IssuanceOfStockAndOptionsSharesServices" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="LicensesAndRoyaltyRevenue" id="gern_LicensesAndRoyaltyRevenue" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LineOfCreditFacilityDescriptionTextBlock" id="gern_LineOfCreditFacilityDescriptionTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LoansReceivableDebtForgiveness" id="gern_LoansReceivableDebtForgiveness" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyMaximumNumberOfMonthsOfCurrentBaseSalaryToBePaidUnderSeverancePlan" id="gern_LossContingencyMaximumNumberOfMonthsOfCurrentBaseSalaryToBePaidUnderSeverancePlan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod" id="gern_LossContingencyTriggeringEventEmployeeTerminationWithoutCauseFollowingChangeOfControlPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity" id="gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlDuringWhichNoComparableEmploymentIsOfferedByEntity" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LossContingencyTriggeringEventPeriodFollowingChangeOfControlWithinWhichEmployeeResignsDueToMaterialChangeInTermsOfEmployment" id="gern_LossContingencyTriggeringEventPeriodFollowingChangeOfControlWithinWhichEmployeeResignsDueToMaterialChangeInTermsOfEmployment" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MarketBasedRestrictedStockAwardsMember" id="gern_MarketBasedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="MaximumCommissionRate" id="gern_MaximumCommissionRate" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MinimumNumberOfHematologicMyeloidMalignanciesThatAreExpectedToBeTreated" id="gern_MinimumNumberOfHematologicMyeloidMalignanciesThatAreExpectedToBeTreated" type="xbrli:integerItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
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  <xsd:element name="NumberOfCustomers" id="gern_NumberOfCustomers" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfFinancialInstitutionsWithWhichCashCashEquivalentsAndMarketableSecuritiesArePlaced" id="gern_NumberOfFinancialInstitutionsWithWhichCashCashEquivalentsAndMarketableSecuritiesArePlaced" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfFirstEvaluablePatientsWithBrainMetastasesInTrial" id="gern_NumberOfFirstEvaluablePatientsWithBrainMetastasesInTrial" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPhase1ClinicalTrialsPerformed" id="gern_NumberOfPhase1ClinicalTrialsPerformed" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfPhase2ClinicalTrialsPerformedForGRN1005" id="gern_NumberOfPhase2ClinicalTrialsPerformedForGRN1005" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NumberOfRulingsForWhichEntitySubstitutedAsPartyInAppeal" id="gern_NumberOfRulingsForWhichEntitySubstitutedAsPartyInAppeal" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OneTimeTerminationBenefitsAndFacilityClosingMember" id="gern_OneTimeTerminationBenefitsAndFacilityClosingMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OneTimeTerminationBenefitsAndImpairmentOfAssetsMember" id="gern_OneTimeTerminationBenefitsAndImpairmentOfAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesExtensionPeriod" id="gern_OperatingLeasesExtensionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OperatingLeasesNumberOfTwoYearExtensionOptions" id="gern_OperatingLeasesNumberOfTwoYearExtensionOptions" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerformanceBasedRestrictedStockAwardsMember" id="gern_PerformanceBasedRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PerformanceBasedRestrictedStockMember" id="gern_PerformanceBasedRestrictedStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="PrivateInvestorMember" id="gern_PrivateInvestorMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ReclassificationOfDepositsToOtherCurrentAssets" id="gern_ReclassificationOfDepositsToOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="RelatedPartyTransactionPercentageOfOriginalCapitalContributionReceivedAsRoyaltyByCoVenturer" id="gern_RelatedPartyTransactionPercentageOfOriginalCapitalContributionReceivedAsRoyaltyByCoVenturer" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOffNonCash" id="gern_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOffNonCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOffUpfrontPayment" id="gern_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOffUpfrontPayment" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="RestructuringAndRelatedCostNumberOfEliminatedPositionsContinuingToProvideServicesThroughVariousDatesInSpecifiedPeriod" id="gern_RestructuringAndRelatedCostNumberOfEliminatedPositionsContinuingToProvideServicesThroughVariousDatesInSpecifiedPeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="RestructuringAndRelatedCostNumberOfPositionsAfterRestructuring" id="gern_RestructuringAndRelatedCostNumberOfPositionsAfterRestructuring" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RestructuringAndRelatedCostNumberOfPositionsBeforeRestructuring" id="gern_RestructuringAndRelatedCostNumberOfPositionsBeforeRestructuring" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="RestructuringChargesExpectedToBeSettledWithCash" id="gern_RestructuringChargesExpectedToBeSettledWithCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" id="gern_ScheduleOfCommonStockReservedForFutureIssuanceTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ScheduleOfDerivativesValuationAssumptionsTableTextBlock" id="gern_ScheduleOfDerivativesValuationAssumptionsTableTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ServiceBasedRestrictedStockMember" id="gern_ServiceBasedRestrictedStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ServiceBasedStockOptionsAndRestrictedStockAwardsMember" id="gern_ServiceBasedStockOptionsAndRestrictedStockAwardsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffPeriodForVestingOfSpecificPortionOfOptions" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardCliffPeriodForVestingOfSpecificPortionOfOptions" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfNewOfferingPeriod" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfNewOfferingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfPurchasePeriod" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardDurationOfPurchasePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOtherDisclosuresAbstract" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOtherDisclosuresAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriod" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsPerformancePeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDurationOfOfferingPeriod" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumDurationOfOfferingPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfOfferingPeriodsInWhichEmployeeMayParticipateAtOneTime" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumPercentageOfAnnualSalaryThatCanBeWithheld" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceOfOptionsGrantedToEmployeesWithOwnershipOfMoreThan10PercentageOfCommonStock" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumExercisePriceOfOptionsGrantedToEmployeesWithOwnershipOfMoreThan10PercentageOfCommonStock" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumPercentageOfOwnershipRequiredForGrantingOptionsAtMinimum110PercentOfFairMarketValue" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardMinimumPercentageOfOwnershipRequiredForGrantingOptionsAtMinimum110PercentOfFairMarketValue" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfConsecutivePurchasePeriodsInEachOfferingPeriod" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsIntrinsicValueAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseShares" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseShares" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseSharesUponAppointment" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsToBeGrantedToPurchaseSharesUponAppointment" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualLifeAbstract" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageRemainingContractualLifeAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsWeightedAverageRemainingContractualTermAbstract" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsWeightedAverageRemainingContractualTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodForWhichSharesMustBeHeldAfterPurchaseBeforeSharesMayBeTraded" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardPeriodForWhichSharesMustBeHeldAfterPurchaseBeforeSharesMayBeTraded" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAvailableForGrantRollForward" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesAvailableForGrantRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardTypesOfVestingSchedules" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardTypesOfVestingSchedules" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsAdditionalServingPeriodOfDirectorInCaseOfDisability" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsAdditionalServingPeriodOfDirectorInCaseOfDisability" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsExpirationTerm" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsExpirationTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirector" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirector" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirectorDueToDeath" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirectorDueToDeath" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirectorDueToDeathOrPermanentDisability" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExercisablePeriodFollowingOptioneesTerminationOfServiceAsDirectorDueToDeathOrPermanentDisability" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationByShareBasedPaymentAwardOptionsPeriodFollowingTerminationOfServiceWithinWhichOptioneeDies" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsPeriodFollowingTerminationOfServiceWithinWhichOptioneeDies" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedGoodsAndNonemployeeServicesCapitalizedCost" id="gern_ShareBasedGoodsAndNonemployeeServicesCapitalizedCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ShareBasedGoodsAndNonemployeeServicesTransactionReclassificationsFromLiabilitiesToStockholdersEquity" id="gern_ShareBasedGoodsAndNonemployeeServicesTransactionReclassificationsFromLiabilitiesToStockholdersEquity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesPrivateOffering" id="gern_StockIssuedDuringPeriodSharesPrivateOffering" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValuePrivateOffering" id="gern_StockIssuedDuringPeriodValuePrivateOffering" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValuePurchaseOfResearchAndDevelopmentAssets" id="gern_StockIssuedDuringPeriodValuePurchaseOfResearchAndDevelopmentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockOptionPlan1992Member" id="gern_StockOptionPlan1992Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="StockOptionsGrantedUponFirstAppointmentToBoardOfDirectorsMember" id="gern_StockOptionsGrantedUponFirstAppointmentToBoardOfDirectorsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="SubsequentDirectorOptionMember" id="gern_SubsequentDirectorOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TATherapeuticsLtdMember" id="gern_TATherapeuticsLtdMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TelomeraseActivationSciencesIncMember" id="gern_TelomeraseActivationSciencesIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TermOfWarrantsIssuedByLegalEntity" id="gern_TermOfWarrantsIssuedByLegalEntity" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="TransOvaGeneticsLCMember" id="gern_TransOvaGeneticsLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="VariableInterestEntityFinancialOrOtherSupportToFundPriorLossesAmount" id="gern_VariableInterestEntityFinancialOrOtherSupportToFundPriorLossesAmount" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="VestingRightsPercentage" id="gern_VestingRightsPercentage" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ViaGenIncMember" id="gern_ViaGenIncMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsIssuedInApril2005Member" id="gern_WarrantsIssuedInApril2005Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsIssuedInAugust2011Member" id="gern_WarrantsIssuedInAugust2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsIssuedInNovember2011Member" id="gern_WarrantsIssuedInNovember2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="WarrantsIssuedInSeptember2009Member" id="gern_WarrantsIssuedInSeptember2009Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="InvesteeCumulativePercentageOwnershipAfterAllTransactions" id="gern_InvesteeCumulativePercentageOwnershipAfterAllTransactions" type="num:percentItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="duration" />
</xsd:schema>
