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<!-- DFIN ActiveDisclosure(SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date      : 2019-11-07T23:14:24.8655073+00:00 -->
<!-- Version            : 5.0.0.208 -->
<!-- Package ID         : 7468a2c102964ddbb18a285b033ddbbe -->
<!-- Copyright (c) 2019 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="fgen_ImpactOfChangeInAccountingPrincipleUponAdoptionOfASU201802Member" name="ImpactOfChangeInAccountingPrincipleUponAdoptionOfASU201802Member" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_ProceedsFromUpfrontNonContingentAndTimeBasedPayments" name="ProceedsFromUpfrontNonContingentAndTimeBasedPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_PotentialMilestones" name="PotentialMilestones" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_CommercialSalesMilestone" name="CommercialSalesMilestone" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_CollaborativeArrangementAggregateConsideration" name="CollaborativeArrangementAggregateConsideration" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_ClinicalDevelopmentMilestonesMember" name="ClinicalDevelopmentMilestonesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_RegulatoryMilestonesMember" name="RegulatoryMilestonesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_TransactionPriceAllocatedToPerformanceObligations" name="TransactionPriceAllocatedToPerformanceObligations" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_PercentageOfFundingForCosts" name="PercentageOfFundingForCosts" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_AdditionalConsiderationBasedOnNetSales" name="AdditionalConsiderationBasedOnNetSales" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_EstimatedJointDevelopmentExtendedServicePeriod" name="EstimatedJointDevelopmentExtendedServicePeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_ProceedsFromUpfrontNonContingentNonRefundableAndTimeBasedPayments" name="ProceedsFromUpfrontNonContingentNonRefundableAndTimeBasedPayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_DevelopmentMilestonePaymentReceived" name="DevelopmentMilestonePaymentReceived" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_AstraZenecaAgreementsMember" name="AstraZenecaAgreementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_UnitedStatesAndRestOfWorldMember" name="UnitedStatesAndRestOfWorldMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_DeferredApprovalMilestoneMember" name="DeferredApprovalMilestoneMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_DevelopmentMilestonesMember" name="DevelopmentMilestonesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_CommercialSalesAndOtherEventsMilestone" name="CommercialSalesAndOtherEventsMilestone" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_ProceedsFromUpfrontNonContingentAndNonRefundablePayments" name="ProceedsFromUpfrontNonContingentAndNonRefundablePayments" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_ContractWithCustomerLiabilityMilestoneMethodRevenueRecognized" name="ContractWithCustomerLiabilityMilestoneMethodRevenueRecognized" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_CashConsiderationReceivedUnderCollaborationAgreement" name="CashConsiderationReceivedUnderCollaborationAgreement" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_CoDevelopmentInformationSharingAndCommitteeServicesMember" name="CoDevelopmentInformationSharingAndCommitteeServicesMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_ChinaPerformanceObligationMember" name="ChinaPerformanceObligationMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_VariableConsiderationPaymentReceivedFromEstimatedFutureCoDevelopmentBilling" name="VariableConsiderationPaymentReceivedFromEstimatedFutureCoDevelopmentBilling" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_SuppliesNet" name="SuppliesNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_BondAndMutualFundsMember" name="BondAndMutualFundsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_TermDepositMember" name="TermDepositMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_LeaseObligationsMember" name="LeaseObligationsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_LongTermPropertyLeaseMember" name="LongTermPropertyLeaseMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_ShorensteinPropertiesLLCMember" name="ShorensteinPropertiesLLCMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_LesseeFinanceLeaseRemainingLeaseMaximumExpansionPeriod" name="LesseeFinanceLeaseRemainingLeaseMaximumExpansionPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_LesseeFinanceLeaseCommencementDate" name="LesseeFinanceLeaseCommencementDate" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_LesseeFinanceLeaseRemainingTerm" name="LesseeFinanceLeaseRemainingTerm" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_NumberOfFinanceLeases" name="NumberOfFinanceLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_BeijingEconomicTechnologicalDevelopmentAreaMember" name="BeijingEconomicTechnologicalDevelopmentAreaMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_LesseeFinanceLeaseExpirationPeriod" name="LesseeFinanceLeaseExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_LesseeFinanceLeaseOptionToExtendAdditionalLeaseTerm" name="LesseeFinanceLeaseOptionToExtendAdditionalLeaseTerm" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_LesseeFinanceLeaseAdditionalLeaseExpirationPeriod" name="LesseeFinanceLeaseAdditionalLeaseExpirationPeriod" type="xbrli:gYearItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_PercentageIncreasesOnEachAnniversaryOfRentCommencementDate" name="PercentageIncreasesOnEachAnniversaryOfRentCommencementDate" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_NumberOfOperatingLeases" name="NumberOfOperatingLeases" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_FinanceLeaseRightOfUseAssetsCost" name="FinanceLeaseRightOfUseAssetsCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_FinanceLeaseAccumulatedAmortization" name="FinanceLeaseAccumulatedAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_OperatingLeaseRightOfUseAssetsCost" name="OperatingLeaseRightOfUseAssetsCost" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_OperatingLeaseAccumulatedAmortization" name="OperatingLeaseAccumulatedAmortization" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_FinanceLeaseAndOperatingLeaseAssets" name="FinanceLeaseAndOperatingLeaseAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit" />
  <xsd:element id="fgen_FinanceLeaseAndOperatingLeaseLiability" name="FinanceLeaseAndOperatingLeaseLiability" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" name="CashPaidForAmountsIncludedInMeasurementOfLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_RightOfUseAssetsObtainedInExchangeForNewLeaseLiabilitiesAbstract" name="RightOfUseAssetsObtainedInExchangeForNewLeaseLiabilitiesAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_WeightedAverageRemainingLeaseTermAbstract" name="WeightedAverageRemainingLeaseTermAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_WeightedAverageDiscountRateAbstract" name="WeightedAverageDiscountRateAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_BuildToSuitArrangementsMember" name="BuildToSuitArrangementsMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_AvailableForSaleSecuritiesContractualMaturityPeriod" name="AvailableForSaleSecuritiesContractualMaturityPeriod" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_NumberOfRegulatoryMilestones" name="NumberOfRegulatoryMilestones" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <xsd:element id="fgen_LaboratoryEquipmentMember" name="LaboratoryEquipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_AccruedPreclinicalAndClinicalTrialCurrent" name="AccruedPreclinicalAndClinicalTrialCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_PropertyTaxesAndOtherCurrent" name="PropertyTaxesAndOtherCurrent" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit" />
  <xsd:element id="fgen_AstellasMember" name="AstellasMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_APIShipmentMember" name="APIShipmentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
  <xsd:element id="fgen_MilestonePaymentMember" name="MilestonePaymentMember" type="nonnum:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true" />
</xsd:schema>
