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  <element name="EquityCommitmentAgreementPeriod" id="arwr_EquityCommitmentAgreementPeriod" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentOwnershipPercentageOnDilutiveBasis" id="arwr_EquityMethodInvestmentOwnershipPercentageOnDilutiveBasis" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInFinancingActivities" id="arwr_EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInFinancingActivities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInInvestingActivities" id="arwr_EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInInvestingActivities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInOperatingActivities" id="arwr_EquityMethodInvestmentSummarizedFinancialInformationNetCashProvidedByUsedInOperatingActivities" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses" id="arwr_EquityMethodInvestmentSummarizedFinancialInformationOperatingExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightConvertibleConversionRatioForFirstYear" id="arwr_ExchangeRightConvertibleConversionRatioForFirstYear" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightConvertibleConversionRatioForFiveYear" id="arwr_ExchangeRightConvertibleConversionRatioForFiveYear" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightConvertibleConversionRatioForFourYear" id="arwr_ExchangeRightConvertibleConversionRatioForFourYear" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightConvertibleConversionRatioForThreeYear" id="arwr_ExchangeRightConvertibleConversionRatioForThreeYear" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightConvertibleConversionRatioForTwoYear" id="arwr_ExchangeRightConvertibleConversionRatioForTwoYear" type="xbrli:pureItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExchangeRightsMember" id="arwr_ExchangeRightsMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisedAtFifteenDollarPerShareMember" id="arwr_ExercisedAtFifteenDollarPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisedAtTenDollarPerShareMember" id="arwr_ExercisedAtTenDollarPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisedAtTwoDollarPerShareMember" id="arwr_ExercisedAtTwoDollarPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExerciseOfStockOptionsPricePerShare" id="arwr_ExerciseOfStockOptionsPricePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ExercisePriceOfWarrants" id="arwr_ExercisePriceOfWarrants" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FacilityAndEquipmentRentExpense" id="arwr_FacilityAndEquipmentRentExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssumptionsAndMethodologyForAssetsTableTextBlock" id="arwr_FairValueAssumptionsAndMethodologyForAssetsTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueAssumptionsAndMethodologyForLiabilitiesTableTextBlock" id="arwr_FairValueAssumptionsAndMethodologyForLiabilitiesTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementsDisclosureLineItems" id="arwr_FairValueMeasurementsDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FairValueMeasurementsDisclosureTable" id="arwr_FairValueMeasurementsDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="FiftyPercentageOfMatchingContributionMember" id="arwr_FiftyPercentageOfMatchingContributionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteAndIndefiniteLivedIntangibleAssetsNetBeginningBalance" id="arwr_FiniteAndIndefiniteLivedIntangibleAssetsNetBeginningBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteAndIndefiniteLivedIntangibleAssetsNetEndingBalance" id="arwr_FiniteAndIndefiniteLivedIntangibleAssetsNetEndingBalance" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" id="arwr_FiniteLivedAndIndefiniteLivedIntangibleAssetsLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossFromSaleOfSubsidiary" id="arwr_GainLossFromSaleOfSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossOnPurchaseOfBusiness" id="arwr_GainLossOnPurchaseOfBusiness" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainLossOnSaleOfStockInSubsidiary" id="arwr_GainLossOnSaleOfStockInSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GainOnAcquisition" id="arwr_GainOnAcquisition" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="GoingConcernAssumptionPoliciesTextBlock" id="arwr_GoingConcernAssumptionPoliciesTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxDisclosureLineItems" id="arwr_IncomeTaxDisclosureLineItems" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IncomeTaxDisclosureTable" id="arwr_IncomeTaxDisclosureTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="IncreaseInMonthlyExpenditureDueToUtilitiesCosts" id="arwr_IncreaseInMonthlyExpenditureDueToUtilitiesCosts" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IndefiniteLivedIntangibleAssetsAccumulatedAmortization" id="arwr_IndefiniteLivedIntangibleAssetsAccumulatedAmortization" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InsertTherapeuticsIncMember" id="arwr_InsertTherapeuticsIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IntangibleAssetsAdditions" id="arwr_IntangibleAssetsAdditions" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestInNotesOffering" id="arwr_InvestInNotesOffering" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentInPreferredStock" id="arwr_InvestmentInPreferredStock" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentInPreferredStockByOutsider" id="arwr_InvestmentInPreferredStockByOutsider" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="InvestmentInSubsidiaryThroughConversionOfIntercompanyDebt" id="arwr_InvestmentInSubsidiaryThroughConversionOfIntercompanyDebt" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuanceOfCommonStockForSubscriptionMember" id="arwr_IssuanceOfCommonStockForSubscriptionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuanceOfWarrants" id="arwr_IssuanceOfWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAsGiftForTenDollarAndNinetyCentsPerShareMember" id="arwr_IssuedAsGiftForTenDollarAndNinetyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAsStockIssuanceCostAtFifteenDollarPerUnitMember" id="arwr_IssuedAsStockIssuanceCostAtFifteenDollarPerUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtApproximatelyEighteenDollarPerShareNetMember" id="arwr_IssuedAtApproximatelyEighteenDollarPerShareNetMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFiftyNineDollarsAndTenCentsPerShareMember" id="arwr_IssuedAtFiftyNineDollarsAndTenCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFiftySevenDollarsAndEightyCentsPerShareMember" id="arwr_IssuedAtFiftySevenDollarsAndEightyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFiveDollarsAndElevenCentsPerShareMember" id="arwr_IssuedAtFiveDollarsAndElevenCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFiveDollarsAndFiftyCentsPerShareToUnidymStockholderInExchangeForUnidymSSharesMember" id="arwr_IssuedAtFiveDollarsAndFiftyCentsPerShareToUnidymStockholderInExchangeForUnidymSSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFiveDollarsAndTwentyCentsPerShareToTelVenturesInExchangeForUnidymSSharesMember" id="arwr_IssuedAtFiveDollarsAndTwentyCentsPerShareToTelVenturesInExchangeForUnidymSSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFortyEightDollarsAndEightyCentsPerShareMember" id="arwr_IssuedAtFortyEightDollarsAndEightyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtFourDollarsPerShareMember" id="arwr_IssuedAtFourDollarsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtSixDollarsAndThirtyCentsPerShareMember" id="arwr_IssuedAtSixDollarsAndThirtyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtSixDollarsAndTwentyThreeCentsPerShareMember" id="arwr_IssuedAtSixDollarsAndTwentyThreeCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThirteenDollarsAndTwelveCentsPerShareMember" id="arwr_IssuedAtThirteenDollarsAndTwelveCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThirtyEightDollarsAndFortyCentsPerShareMember" id="arwr_IssuedAtThirtyEightDollarsAndFortyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThirtyFiveDollarsPerShareMember" id="arwr_IssuedAtThirtyFiveDollarsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThreeDollarsAndEightyCentsPerShareMember" id="arwr_IssuedAtThreeDollarsAndEightyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThreeDollarsAndSeventyCentsPerShareMember" id="arwr_IssuedAtThreeDollarsAndSeventyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtThreeDollarsPerShareMember" id="arwr_IssuedAtThreeDollarsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwentyEightDollarsAndThirtyCentsPerShareToPurchaseSharesOfUnidymIncMember" id="arwr_IssuedAtTwentyEightDollarsAndThirtyCentsPerShareToPurchaseSharesOfUnidymIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwentyNineDollarsAndFiftyCentsPerShareToPurchaseMasaEnergyLlcMember" id="arwr_IssuedAtTwentyNineDollarsAndFiftyCentsPerShareToPurchaseMasaEnergyLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwentyOneDollarsAndEightyCentsPerShareMember" id="arwr_IssuedAtTwentyOneDollarsAndEightyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwentyOneDollarsAndNinetyCentsPerShareToUnidymForAcquisitionOfNanoconductionMember" id="arwr_IssuedAtTwentyOneDollarsAndNinetyCentsPerShareToUnidymForAcquisitionOfNanoconductionMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwentySevenDollarsAndTwentyCentsPerShareToRiceUniversityMember" id="arwr_IssuedAtTwentySevenDollarsAndTwentyCentsPerShareToRiceUniversityMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedAtTwoDollarsAndSeventySixCentsPerShareMember" id="arwr_IssuedAtTwoDollarsAndSeventySixCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedForCashAtFifteenDollarPerUnitMember" id="arwr_IssuedForCashAtFifteenDollarPerUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedForCashAtTenDollarPerUnitMember" id="arwr_IssuedForCashAtTenDollarPerUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedForCashAtZeroPointZeroOneDollarsPerUnitMember" id="arwr_IssuedForCashAtZeroPointZeroOneDollarsPerUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedForMarketableSecuritiesAtTenDollarPerUnitMember" id="arwr_IssuedForMarketableSecuritiesAtTenDollarPerUnitMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedForPurchaseOfCarbonNanotechnologiesIncAtThirtySevenDollarsAndSeventyCentsPerShareMember" id="arwr_IssuedForPurchaseOfCarbonNanotechnologiesIncAtThirtySevenDollarsAndSeventyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedToCalandoStockholdersInExchangeForCalandoSSharesMember" id="arwr_IssuedToCalandoStockholdersInExchangeForCalandoSSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedToPurchaseCalandoPharmaceuticalsIncAtFiftyOneDollarsAndSeventyCentsPerShareMember" id="arwr_IssuedToPurchaseCalandoPharmaceuticalsIncAtFiftyOneDollarsAndSeventyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedToPurchaseInsertTherapeuticsShareAtThirtyNineDollarsAndEightyCentsPerShareMember" id="arwr_IssuedToPurchaseInsertTherapeuticsShareAtThirtyNineDollarsAndEightyCentsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedToUnidymStockholdersInExchangeForUnidymsSharesMember" id="arwr_IssuedToUnidymStockholdersInExchangeForUnidymsSharesMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="IssuedUnderCommittedCapitalAgreementMember" id="arwr_IssuedUnderCommittedCapitalAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="LeonardoBiosystemsIncMember" id="arwr_LeonardoBiosystemsIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MaximumEquityCommitmentAmountUnderAgreement" id="arwr_MaximumEquityCommitmentAmountUnderAgreement" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MinimumStockPriceRequiredToMaintainUnderEquityLineFacility" id="arwr_MinimumStockPriceRequiredToMaintainUnderEquityLineFacility" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MonthlyRemunerationOfEmployee" id="arwr_MonthlyRemunerationOfEmployee" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="MsEnergyLlcMember" id="arwr_MsEnergyLlcMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NanoconductionIncMember" id="arwr_NanoconductionIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NanotopeMember" id="arwr_NanotopeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashConsiderationReceivedInSaleOfInterestInSubsidiary" id="arwr_NonCashConsiderationReceivedInSaleOfInterestInSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryBonds" id="arwr_NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryBonds" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryOwedToThirdParty" id="arwr_NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryOwedToThirdParty" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryShares" id="arwr_NonCashConsiderationReceivedInSaleOfInterestInSubsidiaryShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashImpairmentCharge" id="arwr_NonCashImpairmentCharge" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NonCashImpairmentCharges" id="arwr_NonCashImpairmentCharges" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NoncontrollingInterest" id="arwr_NoncontrollingInterest" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NoncontrollingInterestsPolicyTextBlock" id="arwr_NoncontrollingInterestsPolicyTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfEmployeesAtTimeOfAcquisition" id="arwr_NumberOfEmployeesAtTimeOfAcquisition" type="xbrli:integerItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="NumberOfExchangeRightAreSold" id="arwr_NumberOfExchangeRightAreSold" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ObligationToPayRoyalties" id="arwr_ObligationToPayRoyalties" type="xbrli:stringItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OtherRentalExpenses" id="arwr_OtherRentalExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="OwnershipPercentageInSubsidiary" id="arwr_OwnershipPercentageInSubsidiary" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PaymentsUnderCapitalLease" id="arwr_PaymentsUnderCapitalLease" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfIncreaseInAnnualRentalCost" id="arwr_PercentageOfIncreaseInAnnualRentalCost" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfRoyaltyLiability" id="arwr_PercentageOfRoyaltyLiability" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageOfValuationAllowance" id="arwr_PercentageOfValuationAllowance" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PercentageSharesOwnedByEmployee" id="arwr_PercentageSharesOwnedByEmployee" type="num:percentItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PeriodOfRevenueMilestonesConsideredForContingentPayment" id="arwr_PeriodOfRevenueMilestonesConsideredForContingentPayment" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredClassBAndCMember" id="arwr_PreferredClassBAndCMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredStockIssuanceValuePerShare" id="arwr_PreferredStockIssuanceValuePerShare" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredStockIssuedAtThousandDollarsPerShareMember" id="arwr_PreferredStockIssuedAtThousandDollarsPerShareMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreferredStockRedemptionShares" id="arwr_PreferredStockRedemptionShares" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PreTaxCompensationExpense" id="arwr_PreTaxCompensationExpense" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PricePerShareOfStockIssuedInUnderwrittenPublicOffering" id="arwr_PricePerShareOfStockIssuedInUnderwrittenPublicOffering" type="num:perShareItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountOfNoteNotConvertedInToShares" id="arwr_PrincipalAmountOfNoteNotConvertedInToShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PrincipalAmountOfNoteWhichNotConvertedIntoShares" id="arwr_PrincipalAmountOfNoteWhichNotConvertedIntoShares" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProceedsFromSaleOfStockInSubsidiary" id="arwr_ProceedsFromSaleOfStockInSubsidiary" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PromissoryNotes" id="arwr_PromissoryNotes" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ProvisionForAllowanceForBadDebtsAndSalesRelatedAllowances" id="arwr_ProvisionForAllowanceForBadDebtsAndSalesRelatedAllowances" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="PurchaseConsiderationTableTextBlock" id="arwr_PurchaseConsiderationTableTextBlock" type="nonnum:textBlockItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReimbursementsOfPatentAndLicenseExpenses" id="arwr_ReimbursementsOfPatentAndLicenseExpenses" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RemainingLifeOfWarrant" id="arwr_RemainingLifeOfWarrant" type="xbrli:durationItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RemunerationPaid" id="arwr_RemunerationPaid" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ResearchEquipment" id="arwr_ResearchEquipment" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ReserveAgainstReceivable" id="arwr_ReserveAgainstReceivable" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RocheMadisonIncMember" id="arwr_RocheMadisonIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RocheMadisonMember" id="arwr_RocheMadisonMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="RocheMember" id="arwr_RocheMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ScheduleOfDiscontinuedOperationsTable" id="arwr_ScheduleOfDiscontinuedOperationsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" id="arwr_ScheduleOfFiniteLivedAndIndefiniteLivedIntangibleAssetsTable" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrldt:hypercubeItem"/>
  <element name="SeriesDPreferredStockIssuedForSubscriptionInUnidymMember" id="arwr_SeriesDPreferredStockIssuedForSubscriptionInUnidymMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue" id="arwr_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodFairValue" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="duration" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SharesOwnedByEmployee" id="arwr_SharesOwnedByEmployee" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StatedPercentageOfNotesAndAdvances" id="arwr_StatedPercentageOfNotesAndAdvances" type="num:percentItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StatementStatementOfCashFlowParentheticalAbstract" id="arwr_StatementStatementOfCashFlowParentheticalAbstract" type="xbrli:stringItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuanceCostChargedToAdditionalPaidInCapitalMember" id="arwr_StockIssuanceCostChargedToAdditionalPaidInCapitalMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedAgainstWarrants" id="arwr_StockIssuedAgainstWarrants" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="StockIssuedDuringPeriodSharesNewIssuesByWayOfPublicOffering" id="arwr_StockIssuedDuringPeriodSharesNewIssuesByWayOfPublicOffering" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubscriptionAgreementMember" id="arwr_SubscriptionAgreementMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="SubscriptionsReceivableMember" id="arwr_SubscriptionsReceivableMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TermOfExchangeRights" id="arwr_TermOfExchangeRights" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandFourEquityIncentivePlanMember" id="arwr_TwoThousandFourEquityIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandsFourEquityIncentivePlanMember" id="arwr_TwoThousandsFourEquityIncentivePlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandsStockOptionPlanMember" id="arwr_TwoThousandsStockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="TwoThousandStockOptionPlanMember" id="arwr_TwoThousandStockOptionPlanMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnidymIncMember" id="arwr_UnidymIncMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UnsecuredConvertiblePromissoryNoteAgreements" id="arwr_UnsecuredConvertiblePromissoryNoteAgreements" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="credit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="UpfrontConsiderationOfDiscontinuedOperation" id="arwr_UpfrontConsiderationOfDiscontinuedOperation" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ValueOfCommonStockPurchasedByCash" id="arwr_ValueOfCommonStockPurchasedByCash" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="ValueOfCommonStockPurchasedFromMinorityShareHolders" id="arwr_ValueOfCommonStockPurchasedFromMinorityShareHolders" type="xbrli:monetaryItemType" abstract="false" xbrli:periodType="instant" xbrli:balance="debit" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantFiveMember" id="arwr_WarrantFiveMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantFourMember" id="arwr_WarrantFourMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantOneMember" id="arwr_WarrantOneMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantSevenMember" id="arwr_WarrantSevenMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsExercised" id="arwr_WarrantsExercised" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsIssued" id="arwr_WarrantsIssued" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsIssuedToAcquireCommonStock" id="arwr_WarrantsIssuedToAcquireCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantSixMember" id="arwr_WarrantSixMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantsPurchased" id="arwr_WarrantsPurchased" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantThreeMember" id="arwr_WarrantThreeMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantToPurchaseShareOfCommonStock" id="arwr_WarrantToPurchaseShareOfCommonStock" type="xbrli:sharesItemType" abstract="false" xbrli:periodType="instant" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WarrantTwoMember" id="arwr_WarrantTwoMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WeightedAveragePeriodToRecognizePreTaxCompensationExpense" id="arwr_WeightedAveragePeriodToRecognizePreTaxCompensationExpense" type="xbrli:durationItemType" abstract="false" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
  <element name="WisepowerMember" id="arwr_WisepowerMember" type="nonnum:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" substitutionGroup="xbrli:item"/>
</schema>
</XBRL>
