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<!-- Copyright (c) 2005-2013 R.R. Donnelley & Sons Company All Rights Reserved. -->
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  <element name="EquityIncentivePlanTwoThousandEightMember" id="onvo_EquityIncentivePlanTwoThousandEightMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityIncentivePlanTwoThousandTwelveMember" id="onvo_EquityIncentivePlanTwoThousandTwelveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssumptionExpectedDividendRate" id="onvo_FairValueAssumptionExpectedDividendRate" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInCashDepositsReleasedFromRestriction" id="onvo_IncreaseDecreaseInCashDepositsReleasedFromRestriction" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreaseDecreaseInGrantsReceivable" id="onvo_IncreaseDecreaseInGrantsReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncreasedOfficeSpaceHeadquarters" id="onvo_IncreasedOfficeSpaceHeadquarters" type="num:areaItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeaseAmendmentEffectiveDate" id="onvo_LeaseAmendmentEffectiveDate" type="xbrli:dateItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeaseTermWithOptionToExtend" id="onvo_LeaseTermWithOptionToExtend" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NatureOfOperationsAndBasisOfPresentationPolicyTextBlock" id="onvo_NatureOfOperationsAndBasisOfPresentationPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NhlbiMember" id="onvo_NhlbiMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfAgreementWithConsultantsForServices" id="onvo_NumberOfAgreementWithConsultantsForServices" type="xbrli:integerItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfWarrantExercisedDuringPeriodRecordedAsDerivativeLiability" id="onvo_NumberOfWarrantExercisedDuringPeriodRecordedAsDerivativeLiability" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OfficeSpaceAreaUnderLeaseAgreement" id="onvo_OfficeSpaceAreaUnderLeaseAgreement" type="num:areaItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeasesMonthlyBaseRentExpense" id="onvo_OperatingLeasesMonthlyBaseRentExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OperatingLeasesMonthlyRentExpense" id="onvo_OperatingLeasesMonthlyRentExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OverAllotmentOptionMember" id="onvo_OverAllotmentOptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentForExpenseOnWarrantModification" id="onvo_PaymentForExpenseOnWarrantModification" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrivateMember" id="onvo_PrivateMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProceedsFromIssuanceOfCommonStockAndWarrants" id="onvo_ProceedsFromIssuanceOfCommonStockAndWarrants" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RecentlyAdoptedAccountingStandardsPolicyTextBlock" id="onvo_RecentlyAdoptedAccountingStandardsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueFromResearchCollaborations" id="onvo_RevenueFromResearchCollaborations" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueRecognitionGrantPolicyTextBlock" id="onvo_RevenueRecognitionGrantPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RevenueRecognitionResearchAndDevelopmentRevenuePolicyTextBlock" id="onvo_RevenueRecognitionResearchAndDevelopmentRevenuePolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfSignificantAccountingPoliciesRelatedToBusinessAcquisitionRevenueRecognitionAndEarningsPerShareTable" id="onvo_ScheduleOfSignificantAccountingPoliciesRelatedToBusinessAcquisitionRevenueRecognitionAndEarningsPerShareTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndExpirationsInPeriod" id="onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedAndExpirationsInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedCancelledSurrenderedInPeriod" id="onvo_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedCancelledSurrenderedInPeriod" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedRestrictedPortion" id="onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantedRestrictedPortion" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUponReturnOfCommonShares" id="onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodUponReturnOfCommonShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardQuarterlyAwardVestingRightsRestricted" id="onvo_ShareBasedCompensationArrangementByShareBasedPaymentAwardQuarterlyAwardVestingRightsRestricted" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SignificantAccountingPoliciesRelatedToBusinessAcquisitionRevenueRecognitionAndEarningsPerShareLineItems" id="onvo_SignificantAccountingPoliciesRelatedToBusinessAcquisitionRevenueRecognitionAndEarningsPerShareLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockholdersEquityDuringPeriodIssuanceOfCommonStockFromWarrantExercises" id="onvo_StockholdersEquityDuringPeriodIssuanceOfCommonStockFromWarrantExercises" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesStockOptionsExercisedPriceRemainingPeriod" id="onvo_StockIssuedDuringPeriodSharesStockOptionsExercisedPriceRemainingPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandTwelvePlanMember" id="onvo_TwoThousandTwelvePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnderwritingAgreementMember" id="onvo_UnderwritingAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantEarningPeriodThroughIssuanceOfCommonStock" id="onvo_WarrantEarningPeriodThroughIssuanceOfCommonStock" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantOrRightExpenseOrRevenueRecognized" id="onvo_WarrantOrRightExpenseOrRevenueRecognized" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantReclassifiedEquityInstruments" id="onvo_WarrantReclassifiedEquityInstruments" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsCashlessExerciseNumber" id="onvo_WarrantsCashlessExerciseNumber" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>


