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  <element id="gern_CollaborativeArrangementContinuationElectionMilestonePayment" name="CollaborativeArrangementContinuationElectionMilestonePayment" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementDevelopmentAndRegulatoryMilestonesAggregateMaximum" name="CollaborativeArrangementDevelopmentAndRegulatoryMilestonesAggregateMaximum" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementTieredRoyaltiesPercentageHighEndOfRange" name="CollaborativeArrangementTieredRoyaltiesPercentageHighEndOfRange" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementFullUSRightsFee" name="CollaborativeArrangementFullUSRightsFee" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementTieredRoyaltiesPercentageLowEndOfRange" name="CollaborativeArrangementTieredRoyaltiesPercentageLowEndOfRange" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementSalesMilestonesAggregateMaximum" name="CollaborativeArrangementSalesMilestonesAggregateMaximum" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_StockIssuedDuringPeriodSharesNetExerciseOfWarrants" name="StockIssuedDuringPeriodSharesNetExerciseOfWarrants" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_UpfrontPaymentReceivedFromJanssenUnderCollaborationAgreement" name="UpfrontPaymentReceivedFromJanssenUnderCollaborationAgreement" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementAccruedCollaborationChargesCurrent" name="CollaborativeArrangementAccruedCollaborationChargesCurrent" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementDrugSupplyProcurementPeriodMaximum" name="CollaborativeArrangementDrugSupplyProcurementPeriodMaximum" nillable="true" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_CollaborativeArrangementIPExclusivelyLicensedMember" name="CollaborativeArrangementIPExclusivelyLicensedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_IncreaseDecreaseInAccruedCollaborationCharges" name="IncreaseDecreaseInAccruedCollaborationCharges" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ExercisePriceRangeFromDollars1.10To1.51Member" name="ExercisePriceRangeFromDollars1.10To1.51Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_IssuanceOfCommonStockFor401KMatchingContributions" name="IssuanceOfCommonStockFor401KMatchingContributions" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesIssuedUnderPlan" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAggregateSharesIssuedUnderPlan" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_JanssenPharmaceuticalsIncMember" name="JanssenPharmaceuticalsIncMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseAgreementDisclosureAbstract" name="LicenseAgreementDisclosureAbstract" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_UpfrontPaymentUnderLicenseAgreement" name="UpfrontPaymentUnderLicenseAgreement" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="debit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LeastNumberOfProductsUnderLicenseAgreement" name="LeastNumberOfProductsUnderLicenseAgreement" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseAgreementGeronCostSharingPercentage" name="LicenseAgreementGeronCostSharingPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseAgreementJanssenPharmaCostSharingPercentage" name="LicenseAgreementJanssenPharmaCostSharingPercentage" nillable="true" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseAgreementDevelopmentAndRegulatoryMilestoneAggregateMaximum" name="LicenseAgreementDevelopmentAndRegulatoryMilestoneAggregateMaximum" nillable="true" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xbrli:balance="credit" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseAgreementTieredRoyaltiesPercentageRange" name="LicenseAgreementTieredRoyaltiesPercentageRange" nillable="true" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_SecuritiesAndDerivativesLawsuitsMember" name="SecuritiesAndDerivativesLawsuitsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ExercisePriceRangeFromDollars2.74To5.01Member" name="ExercisePriceRangeFromDollars2.74To5.01Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ExercisePriceRangeFromDollars5.09To9.32Member" name="ExercisePriceRangeFromDollars5.09To9.32Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ExercisePriceRangeFromDollars1.55To2.54Member" name="ExercisePriceRangeFromDollars1.55To2.54Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_SecuritiesLawsuitsMember" name="SecuritiesLawsuitsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_StockholderDerivativesLawsuitsMember" name="StockholderDerivativesLawsuitsMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_StockholderDerivativesLawsuitsFiledInSuperiorCourtOfCaliforniaMember" name="StockholderDerivativesLawsuitsFiledInSuperiorCourtOfCaliforniaMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_StockholderDerivativesLawsuitsFiledInCaliforniaDistrictCourtMember" name="StockholderDerivativesLawsuitsFiledInCaliforniaDistrictCourtMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LicenseArrangementIPExclusivelyLicensedMember" name="LicenseArrangementIPExclusivelyLicensedMember" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_WarrantsExercisedInMarch2015Member" name="WarrantsExercisedInMarch2015Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_ShareBasedCompensationForfeituresAndExpirationsInPeriodNet" name="ShareBasedCompensationForfeituresAndExpirationsInPeriodNet" nillable="true" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_LossContingencyNumberOfClassActionLawsuitsthatHaveBeenFiled" name="LossContingencyNumberOfClassActionLawsuitsthatHaveBeenFiled" nillable="true" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" xmlns="http://www.w3.org/2001/XMLSchema" />
  <element id="gern_WarrantsExercisedInDecember2014Member" name="WarrantsExercisedInDecember2014Member" nillable="true" type="nonnum:domainItemType" substitutionGroup="xbrli:item" abstract="true" xbrli:periodType="duration" xmlns="http://www.w3.org/2001/XMLSchema" />
</xsd:schema>
