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  <xsd:element name="EquityMethodInvestmentPercentageSaleProceedsReceivable" id="gern_EquityMethodInvestmentPercentageSaleProceedsReceivable" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="FirstDirectorOptionMember" id="gern_FirstDirectorOptionMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GEHealthcareUKLimitedMember" id="gern_GEHealthcareUKLimitedMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="Geron401KPlanMember" id="gern_Geron401KPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GrossUnrealizedGainsAvailableForSaleSecurities" id="gern_GrossUnrealizedGainsAvailableForSaleSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="GrossUnrealizedLossesAvailableForSaleSecurities" id="gern_GrossUnrealizedLossesAvailableForSaleSecurities" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="ImpairmentOfAssetsMember" id="gern_ImpairmentOfAssetsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="IncentiveAwardPlan2011Member" id="gern_IncentiveAwardPlan2011Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <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="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberSubjectToRepurchase" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumberSubjectToRepurchase" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <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" />
  <xsd:element name="LossContingencyMinimumNumberOfMonthsOfCurrentBaseSalaryToBePaidUnderSeverancePlan" id="gern_LossContingencyMinimumNumberOfMonthsOfCurrentBaseSalaryToBePaidUnderSeverancePlan" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <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="MarketBasedRestrictedStockMember" id="gern_MarketBasedRestrictedStockMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="MaximumCommissionRate" id="gern_MaximumCommissionRate" type="num:percentItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="NonEmployeeOptionsMember" id="gern_NonEmployeeOptionsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="November2011RestructuringPlanMember" id="gern_November2011RestructuringPlanMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <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="NumberOfRulingsForWhichEntitySubstitutedAsPartyInAppeal" id="gern_NumberOfRulingsForWhichEntitySubstitutedAsPartyInAppeal" 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="ReclassificationOfDepositsToOtherCurrentAssets" id="gern_ReclassificationOfDepositsToOtherCurrentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" 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="RestructuringChargesExpectedToBeSettledWithCash" id="gern_RestructuringChargesExpectedToBeSettledWithCash" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="debit" 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="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="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="ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" id="gern_ShareBasedCompensationByShareBasedPaymentAwardOptionsMaximumExpirationTermForOptionsGrantedToOptioneesWithOwnershipOfMoreThan10PercentageOfCommonStock" 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="StockIssuedDuringPeriodValuePurchaseOfResearchAndDevelopmentAssets" id="gern_StockIssuedDuringPeriodValuePurchaseOfResearchAndDevelopmentAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:balance="credit" 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="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="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:element name="NumberOfProductsAvailableForSale" id="gern_NumberOfProductsAvailableForSale" type="xbrli:integerItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="AgreementsAxis" id="gern_AgreementsAxis" type="xbrli:stringItemType" substitutionGroup="xbrldt:dimensionItem" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AgreementsDomain" id="gern_AgreementsDomain" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="AtTheMarketIssuanceSalesAgreementMember" id="gern_AtTheMarketIssuanceSalesAgreementMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOptionsGrantedWithExercisePriceBelowOrGreaterThanFairValueAtDateOfGrant" id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfOptionsGrantedWithExercisePriceBelowOrGreaterThanFairValueAtDateOfGrant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NonmonetaryTransactionsPolicyTextBlock" id="gern_NonmonetaryTransactionsPolicyTextBlock" type="nonnum:textBlockItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CarryingValueOfStemCellAssets" id="gern_CarryingValueOfStemCellAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="ExercisePriceRangeFromDollars1.10To1.50Member" id="gern_ExercisePriceRangeFromDollars1.10To1.50Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeFromDollars1.51To1.70Member" id="gern_ExercisePriceRangeFromDollars1.51To1.70Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeFromDollars1.71To6.39Member" id="gern_ExercisePriceRangeFromDollars1.71To6.39Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeFromDollars6.40To9.32Member" id="gern_ExercisePriceRangeFromDollars6.40To9.32Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="ExercisePriceRangeFromDollars1.10To9.32Member" id="gern_ExercisePriceRangeFromDollars1.10To9.32Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="LockUpPeriodFollowingPublicOffering" id="gern_LockUpPeriodFollowingPublicOffering" type="xbrli:durationItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="GainLossOnAssetsSurrendered" id="gern_GainLossOnAssetsSurrendered" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="LiabilityRelatingToContractualObligationToDistributeCommonStock" id="gern_LiabilityRelatingToContractualObligationToDistributeCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element name="StockAndOptionsIssuedDuringPeriodValueIssuedForServices" id="gern_StockAndOptionsIssuedDuringPeriodValueIssuedForServices" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock" id="gern_StockIssuedDuringPeriodValueRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element name="StockIssuedDuringPeriodSharesRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock" id="gern_StockIssuedDuringPeriodSharesRestrictedStockAwardForfeituresNetOfIssuancesOfCommonStock" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OneTimeTerminationBenefitsAndFacilityRelatedChargesMember" id="gern_OneTimeTerminationBenefitsAndFacilityRelatedChargesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockCarryingValueAssigned" id="gern_CommonStockCarryingValueAssigned" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="OtherCommitmentsIndemnificationsOfficersAndDirectorsMember" id="gern_OtherCommitmentsIndemnificationsOfficersAndDirectorsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="OtherCommitmentIndemnificationObligations" id="gern_OtherCommitmentIndemnificationObligations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element name="SalesAgreementAbstract" id="gern_SalesAgreementAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="EquityIssuancePerShareAmountAtPublicOffering" id="gern_EquityIssuancePerShareAmountAtPublicOffering" type="num:perShareItemType" substitutionGroup="xbrli:item" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfSharesToBeReceived" id="gern_NumberOfSharesToBeReceived" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="NumberOfSharesHeld" id="gern_NumberOfSharesHeld" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="instant" />
  <xsd:element name="CorporateNoteSecuritiesDueInLessThanOneYearMember" id="gern_CorporateNoteSecuritiesDueInLessThanOneYearMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CorporateNoteSecuritiesDueInOneToTwoYearsMember" id="gern_CorporateNoteSecuritiesDueInOneToTwoYearsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommonStockDistributionRatio" id="gern_CommonStockDistributionRatio" type="xbrli:pureItemType" substitutionGroup="xbrli:item" abstract="false" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="CommercialPaperDueInLessThanOneYearMember" id="gern_CommercialPaperDueInLessThanOneYearMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="USGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember" id="gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInOneToTwoYearsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
  <xsd:element name="USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember" id="gern_USGovernmentSponsoredEnterprisesDebtSecuritiesDueInLessThanOneYearMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration" />
</xsd:schema>


