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        <PersonNm>DR WILLIAM POUNDS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR ANDREW LO</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <PersonNm>DR ARTHUR SCHLEIFER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MR MICHAEL BONNEY</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>THE HON DEVAL PATRICK</PersonNm>
        <TitleTxt>DIRECTOR - END 3/18</TitleTxt>
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        <PersonNm>MS AMY SCHULMAN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR PAUL L JOSKOW</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MR MARTIN MULLINS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MS CAROLINE ROMANO</PersonNm>
        <TitleTxt>ASST SECRETARY</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MS LAURA KETCHUM</PersonNm>
        <TitleTxt>CFO - END 10/17</TitleTxt>
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        <PersonNm>MS JULIA FANTASIA</PersonNm>
        <TitleTxt>CFO &amp; TREASURER (START 11/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR GERALD FINK</PersonNm>
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        <PersonNm>DR RUDOLF JAENISCH</PersonNm>
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        <PersonNm>DR RICHARD YOUNG</PersonNm>
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        <PersonNm>DR TERRY ORR-WEAVER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR HAZEL SIVE</PersonNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>THE INVESTMENT FUND FOR FOUNDATIONS</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>170 N Radnor Chester Rd 300</AddressLine1Txt>
            <CityNm>RADNOR</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
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          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>MORSE BARNES-BROWN</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>230 3rd Ave4th Floor</AddressLine1Txt>
            <CityNm>WALTHAM</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02451</ZIPCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Salt Creek Catering</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>15 Brewer Lane</AddressLine1Txt>
            <CityNm>READING</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>PIDC CONSTRUCTION CORP</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>25 BIRCH STREET</AddressLine1Txt>
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            <StateAbbreviationCd>MA</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>WOLF GREENFIELD SACKS PC</PersonNm>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>600 ATLANTIC AVE</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02210</ZIPCd>
          </USAddress>
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      <GovernmentGrantsAmt>20303732</GovernmentGrantsAmt>
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      <NoncashContributionsAmt>207040</NoncashContributionsAmt>
      <TotalContributionsAmt>32935474</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>SCIENTIFIC SERVICES</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>1740021</TotalRevenueColumnAmt>
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      <TotalProgramServiceRevenueAmt>1740021</TotalProgramServiceRevenueAmt>
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        <ExclusionAmt>9003581</ExclusionAmt>
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      <RoyaltiesRevenueGrp>
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        <ExclusionAmt>7902324</ExclusionAmt>
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      <GrossRentsGrp>
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        <PersonalAmt>0</PersonalAmt>
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        <TotalRevenueColumnAmt>259925</TotalRevenueColumnAmt>
        <ExclusionAmt>259925</ExclusionAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>17964937</TotalRevenueColumnAmt>
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        <ExclusionAmt>120125</ExclusionAmt>
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      <OtherRevenueMiscGrp>
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        <ExclusionAmt>267087</ExclusionAmt>
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        <ProgramServicesAmt>959306</ProgramServicesAmt>
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        <FundraisingAmt>6650</FundraisingAmt>
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        <ManagementAndGeneralAmt>282073</ManagementAndGeneralAmt>
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      <FeesForSrvcInvstMgmntFeesGrp>
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        <ManagementAndGeneralAmt>1918068</ManagementAndGeneralAmt>
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        <FundraisingAmt>132622</FundraisingAmt>
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        <ProgramServicesAmt>4804</ProgramServicesAmt>
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        <ProgramServicesAmt>303116</ProgramServicesAmt>
        <ManagementAndGeneralAmt>170379</ManagementAndGeneralAmt>
        <FundraisingAmt>45425</FundraisingAmt>
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        <ProgramServicesAmt>224881</ProgramServicesAmt>
        <ManagementAndGeneralAmt>641875</ManagementAndGeneralAmt>
        <FundraisingAmt>6503</FundraisingAmt>
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        <ProgramServicesAmt>3756949</ProgramServicesAmt>
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        <ProgramServicesAmt>2156542</ProgramServicesAmt>
        <ManagementAndGeneralAmt>324804</ManagementAndGeneralAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>269202</ProgramServicesAmt>
        <ManagementAndGeneralAmt>74374</ManagementAndGeneralAmt>
        <FundraisingAmt>31558</FundraisingAmt>
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      <PymtTravelEntrtnmntPubOfclGrp>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>284199</ProgramServicesAmt>
        <ManagementAndGeneralAmt>128438</ManagementAndGeneralAmt>
        <FundraisingAmt>65002</FundraisingAmt>
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        <ProgramServicesAmt>2767139</ProgramServicesAmt>
        <ManagementAndGeneralAmt>328020</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>4059000</ProgramServicesAmt>
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        <ProgramServicesAmt>238586</ProgramServicesAmt>
        <ManagementAndGeneralAmt>35934</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>7735125</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>FELLOWSHIPS</Desc>
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        <ProgramServicesAmt>3167492</ProgramServicesAmt>
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      <OtherExpensesGrp>
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      <InventoriesForSaleOrUseGrp>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
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      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>false</AccountantCompileOrReviewInd>
      <FSAuditedInd>true</FSAuditedInd>
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      <AuditCommitteeInd>true</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>true</FederalGrantAuditRequiredInd>
      <FederalGrantAuditPerformedInd>true</FederalGrantAuditPerformedInd>
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    <IRS990ScheduleA documentId="IRS990ScheduleA">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
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        <TotalAmt>187829989</TotalAmt>
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      </TaxRevLeviedOrgnztnlBnft170Grp>
      <GovtFurnSrvcFcltsVl170Grp>
        <TotalAmt>0</TotalAmt>
      </GovtFurnSrvcFcltsVl170Grp>
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      <SubstantialContributorsTotAmt>0</SubstantialContributorsTotAmt>
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      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>21942994</CurrentTaxYearMinus4YearsAmt>
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        <TotalAmt>89601265</TotalAmt>
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      <PublicSupportPY170Pct>0.66373</PublicSupportPY170Pct>
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      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE TOTAL AMOUNT REPORTED ON LINE 10 INCLUDES PROCESSING FEES FOR ADMINISTRATION OF ROYALTIES AND OTHER MISCELLANEOUS ADMINISTRATIVE INCOME.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PARTS I &amp; II</FormAndLineReferenceDesc>
        <ExplanationTxt>IN 2018 WHITEHEAD INSTITUTE FILED FORM 8940, "REQUEST FOR MISCELLANEOUS DETERMINATION" TO REQUEST A DETERMINATION LETTER RECOGNIZING ITS CHANGE OF PUBLIC CHARITY STATUS TO A PUBLICLY SUPPORTED ORGANIZATION DESCRIBED IN IRC SECTION 170(B)(1)(A)(VI). ON JUNE 19, 2018 THE IRS ISSUED A DETERMINATION LETTER STATING IT ACCEPTED THE CHANGE AND HAD UPDATED ITS RECORDS ACCORDINGLY.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="IRS990ScheduleB" />
    <IRS990ScheduleC documentId="IRS990ScheduleC">
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      <TotalDirectLobbyingGrp />
      <TotalLobbyingExpendGrp />
      <OtherExemptPurposeExpendGrp />
      <TotalExemptPurposeExpendGrp />
      <LobbyingNontaxableAmountGrp />
      <GrassrootsNontaxableGrp />
      <TotLbbyngGrassrootMnsNonTxGrp />
      <TotLbbyExpendMnsLbbyngNonTxGrp />
      <VolunteersInd>false</VolunteersInd>
      <PaidStaffOrManagementInd>false</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>false</MediaAdvertisementsInd>
      <MailingsMembersInd>false</MailingsMembersInd>
      <PublicationsOrBroadcastInd>false</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>false</GrantsOtherOrganizationsInd>
      <DirectContactLegislatorsInd>false</DirectContactLegislatorsInd>
      <RalliesDemonstrationsInd>false</RalliesDemonstrationsInd>
      <OtherActivitiesInd>true</OtherActivitiesInd>
      <OtherActivitiesAmt>8560</OtherActivitiesAmt>
      <TotalLobbyingExpendituresAmt>8560</TotalLobbyingExpendituresAmt>
      <NotDescribedSection501c3Ind>false</NotDescribedSection501c3Ind>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE C, PART II-B, LINE 1I:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE BELONGS TO MEMBER ORGANIZATIONS WHICH MAY ENGAGE IN LOBBYING ACTIVITIES. AMOUNT REPORTED IN PART II-B, LINE 1I REPRESENTS THE AMOUNT OF DUES PAID ATTRIBUTABLE TO LOBBYING ACTIVITIES BASED ON INFORMATION PROVIDED BY THE MEMBER ORGANIZATIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleC>
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      <SolicitedAssetsSaleInd>false</SolicitedAssetsSaleInd>
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        <ContributionsAmt>10000000</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>46934592</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>21337681</OtherExpendituresAmt>
        <EndYearBalanceAmt>519177251</EndYearBalanceAmt>
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        <ContributionsAmt>5000000</ContributionsAmt>
        <InvestmentEarningsOrLossesAmt>61980431</InvestmentEarningsOrLossesAmt>
        <OtherExpendituresAmt>21071215</OtherExpendituresAmt>
        <EndYearBalanceAmt>483580340</EndYearBalanceAmt>
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        <InvestmentEarningsOrLossesAmt>-11779884</InvestmentEarningsOrLossesAmt>
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        <EndYearBalanceAmt>437671124</EndYearBalanceAmt>
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        <OtherExpendituresAmt>20305245</OtherExpendituresAmt>
        <EndYearBalanceAmt>470283553</EndYearBalanceAmt>
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        <EndYearBalanceAmt>478119833</EndYearBalanceAmt>
      </CYMinus4YrEndwmtFundGrp>
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      <TermEndowmentBalanceEOYPct>0.00300</TermEndowmentBalanceEOYPct>
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        <BookValueAmt>3977500</BookValueAmt>
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        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>HEDGE FUNDS - ABSOLUTE RETURN</Desc>
        <BookValueAmt>67931862</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
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      <OtherSecuritiesGrp>
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      <OtherSecuritiesGrp>
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      <OtherSecuritiesGrp>
        <Desc>MONEY MARKET FUND</Desc>
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        <MethodValuationCd>F</MethodValuationCd>
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      <FederalIncomeTaxLiabilityAmt>0</FederalIncomeTaxLiabilityAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>POST RETIREMENT HEALTH BENEFIT</Desc>
        <Amt>1240259</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>DEFERRED COMPENSATION PLANS</Desc>
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      <OtherLiabilitiesOrgGrp>
        <Desc>CHARITABLE GIFT ANNUITY LIABILITY</Desc>
        <Amt>33097</Amt>
      </OtherLiabilitiesOrgGrp>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <NetUnrealizedGainsInvstAmt>24874803</NetUnrealizedGainsInvstAmt>
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      <RevenueSubtotalAmt>70193474</RevenueSubtotalAmt>
      <TotalRevenuePerForm990Amt>70193474</TotalRevenuePerForm990Amt>
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      <OtherExpensesIncludedAmt>539275</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>539275</ExpensesNotReportedAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE'S ART COLLECTION WAS PURCHASED WITH A GIFT FROM ITS FOUNDER, EDWIN C. WHITEHEAD. THE COLLECTION CONSISTS OF 79 ARTWORKS EXECUTED IN OIL, ACRYLIC, WATERCOLOR AND MIXED MEDIA, PRINTS AND PHOTOGRAPHY. THE COLLECTION'S PURPOSE IS TO HELP CREATE/FOSTER A STIMULATING ENVIRONMENT THAT PROMOTES AN INNOVATIVE CULTURE TO ACHIEVE THE MISSION OF THE INSTITUTE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE'S ENDOWMENT FUNDS ARE USED TO UNDERWRITE THE RESEARCH PROGRAM OF THE INSTITUTE AS WELL AS TO FUND THE ADMINISTRATION AND OPERATION OF THE INSTITUTE. THE INSTITUTE HAS ADOPTED ENDOWMENT INVESTMENT AND SPENDING POLICIES THAT ATTEMPT TO PROVIDE A PREDICTABLE STREAM OF FUNDING TO THE INSTITUTE'S MISSION, SUPPORTED BY ITS ENDOWMENT, WHILE SEEKING TO MAINTAIN THE PURCHASING POWER OF ENDOWMENT ASSETS. THESE POLICIES DETERMINE THE AMOUNT THAT MAY BE DRAWN FROM ITS ENDOWMENT FUNDS. THE INSTITUTE DRAWS FUNDS FOR RESEARCH AND OPERATIONS, AS APPROVED BY THE BOARD, FROM TOTAL INVESTMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>WHITEHEAD INSTITUTE FOR BIOMEDICAL RESEARCH ("THE INSTITUTE") DID NOT REPORT A LIABILITY FOR UNCERTAIN TAX POSITIONS. THE INSTITUTE'S FIN 48 FOOTNOTE IS AS FOLLOWS: THE INSTITUTE IS A TAX-EXEMPT ORGANIZATION UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE. THE INSTITUTE COMPLIES WITH AUTHORITATIVE GUIDANCE AND ACCOUNTING FOR AND DISCLOSURE OF UNCERTAINTY IN TAX POSITIONS. THE TAX CUTS AND JOBS ACT (THE "ACT") WAS ENACTED ON DECEMBER 22, 2017. THE ACT IMPACTS THE INSTITUTE IN SEVERAL WAYS INCLUDING INCREASES TO UNRELATED BUSINESS TAXABLE INCOME (UBTI) BY THE AMOUNT OF CERTAIN FRINGE BENEFITS FOR WHICH A DEDUCTION IS NOT ALLOWED, CHANGES TO THE NET OPERATING LOSS RULES, REPEAL OF THE ALTERNATIVE MINIMUM TAX (AMT), AND THE COMPUTATION OF UBTI SEPARATELY FOR EACH UNRELATED TRADE OR BUSINESS. FURTHER, THE ACT REDUCES THE U.S. FEDERAL CORPORATE TAX RATE AND FEDERAL CORPORATE UNRELATED BUSINESS INCOME TAX RATE FROM 35% TO 21%. THE OVERALL IMPACT OF THE ACT REMAINS UNCERTAIN AND THE FULL IMPACT OF THE ACT WILL NOT BE KNOWN UNTIL FURTHER REGULATORY GUIDANCE IS PROVIDED TO ASSIST THE INSTITUTE WITH CALCULATING ANY RELATED INCOME TAX LIABILITIES. THE INSTITUTE CONTINUES TO EVALUATE THE IMPACT OF TAX REFORM ON THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART XI, LINE 2D:</FormAndLineReferenceDesc>
        <ExplanationTxt>RENTAL EXPENSES - $539,275</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE D, PART XII, LINE 2D:</FormAndLineReferenceDesc>
        <ExplanationTxt>RENTAL EXPENSES - $539,275</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleF documentId="IRS990ScheduleF">
      <AccountActivitiesOutsideUSGrp>
        <RegionTxt>Central America and the Caribbean</RegionTxt>
        <TypeOfActivitiesConductedTxt>Investments</TypeOfActivitiesConductedTxt>
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      </AccountActivitiesOutsideUSGrp>
      <SubtotalSpentAmt>76385789</SubtotalSpentAmt>
      <TotalSpentAmt>76385789</TotalSpentAmt>
      <TransferToForeignCorpInd>true</TransferToForeignCorpInd>
      <InterestInForeignTrustInd>false</InterestInForeignTrustInd>
      <ForeignCorpOwnershipInd>true</ForeignCorpOwnershipInd>
      <PassiveForeignInvestmestCoInd>true</PassiveForeignInvestmestCoInd>
      <ForeignPartnershipInd>true</ForeignPartnershipInd>
      <BoycottCountriesInd>false</BoycottCountriesInd>
    </IRS990ScheduleF>
    <IRS990ScheduleI documentId="IRS990ScheduleI">
      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BOSTON UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>25 BUICK STREET</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02215</ZIPCd>
        </USAddress>
        <RecipientEIN>042103547</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>91688</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>DANA-FARBER CANCER INSTITUTE</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>450 BROOKLINE AVENUE</AddressLine1Txt>
          <CityNm>BROOKLINE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02215</ZIPCd>
        </USAddress>
        <RecipientEIN>042263040</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>1180107</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>HARVARD UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1350 MASS AVENUE</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02138</ZIPCd>
        </USAddress>
        <RecipientEIN>042103580</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>448791</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
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          <BusinessNameLine1Txt>BOSTON CHILDREN'S HOSPITAL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>300 LONGWOOD AVENUE</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <RecipientEIN>042774441</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>265618</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>TUFTS UNIVERSITY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>169 HOLLAND STREET</AddressLine1Txt>
          <AddressLine2Txt>TUFTS ADMIN BUILDING 3RD FLOOR</AddressLine2Txt>
          <CityNm>SOMERVILLE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02144</ZIPCd>
        </USAddress>
        <RecipientEIN>042103634</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>115023</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARD</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MASS GENERAL HOSPITAL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>55 FRUIT ST</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02114</ZIPCd>
        </USAddress>
        <RecipientEIN>041564655</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>12306</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BRIGHAM AND WOMEN'S HOSPITAL</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>75 FRANCIS ST</AddressLine1Txt>
          <CityNm>BOSTON</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <RecipientEIN>042312909</RecipientEIN>
        <IRCSectionDesc>501(C)(3)</IRCSectionDesc>
        <CashGrantAmt>41122</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
      </RecipientTable>
      <Total501c3OrgCnt>7</Total501c3OrgCnt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE I, PART I, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>GRANT FUNDS ARE MANAGED IN ACCORDANCE WITH THE INSTITUTE'S RULES AND REGULATIONS. EXPENDITURES ARE REVIEWED TO ENSURE THAT THE COSTS INCURRED AND CHARGED TO A PARTICULAR GRANT ARE IN COMPLIANCE WITH THE INSTITUTE'S POLICIES AND GRANTOR REQUIREMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
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      <HousingAllowanceOrResidenceInd>X</HousingAllowanceOrResidenceInd>
      <WrittenPolicyRefTAndEExpnssInd>true</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>true</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>false</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>false</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>true</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR DAVID PAGE</PersonNm>
        <TitleTxt>DIRECTOR/PRESIDENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>363540</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>363540</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MR MARTIN MULLINS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>35000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>13124</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>30475</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>469540</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR GERALD FINK</PersonNm>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>7505</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>30475</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>6972</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RUDOLF JAENISCH</PersonNm>
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        <OtherCompensationFilingOrgAmt>6372</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>30475</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>358186</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS LAURA KETCHUM</PersonNm>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>914</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>25196</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>259824</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
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        <OtherCompensationFilingOrgAmt>28150</OtherCompensationFilingOrgAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>346991</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR TERRY ORR-WEAVER</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <DeferredCompensationFlngOrgAmt>30475</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>5244</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>341330</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR HAZEL SIVE</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>50171</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28614</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>8832</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>342484</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS JULIA FANTASIA</PersonNm>
        <TitleTxt>CFO &amp; TREASURER (START 11/2017</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>20000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>12205</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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      <SupplementalInformationDetail>
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      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 7 &amp; PART II, COLUMN (B)(II):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BONUS REPORTED IN COLUMN B(II) FOR MR. MARTIN MULLINS REPRESENTS A NON-FIXED PAYMENT MADE TO MR. MARTIN MULLINS IN RECOGNITION OF MEETING CERTAIN PERFORMANCE GOALS FOR CALENDAR YEAR 2017. THE BONUS REPORTED IN COLUMN B(II) FOR MS. JULIA FANTASIA REPRESENTS A NON-FIXED PAYMENT MADE TO MS. JULIA FANTASIA IN RECOGNITION OF WORK PERFORMED IN THE ROLE OF INTERIM CFO. MS. CAROLINE ROMANO ALSO RECEIVED A NON-FIXED BONUS PAYMENT IN RECOGNITION OF MEETING CERTAIN PERFORMANCE GOALS. THIS AMOUNT IS INCLUDED IN FORM 990, PART VII, SECTION A, COLUMN (D).</ExplanationTxt>
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    </IRS990ScheduleJ>
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        <IssuerName>
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        <OnBehalfOfIssuerInd>true</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
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      <TaxExemptBondsProceedsGrp>
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        <IssuanceCostsFromProceedsAmt>581560</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>10000000</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>33000000</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
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        <CurrentRefundingInd>true</CurrentRefundingInd>
        <AdvanceRefundingInd>false</AdvanceRefundingInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
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        <BondReferenceCd>A</BondReferenceCd>
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        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>false</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
        <PrivateBusUseByOthersPct>0</PrivateBusUseByOthersPct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <RemedialActionTakenInd>false</RemedialActionTakenInd>
        <ProcsNonqualifiedBondRemdtdInd>true</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <RebateNotDueYetInd>false</RebateNotDueYetInd>
        <ExceptionToRebateInd>false</ExceptionToRebateInd>
        <NoRebateDueInd>true</NoRebateDueInd>
        <VariableRateIssueInd>false</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>false</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </HedgeProviderName>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GICProviderName>
          <BusinessNameLine1Txt>0</BusinessNameLine1Txt>
        </GICProviderName>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, SCHEDULE K, PART I, COLUMN F, LINE A:</FormAndLineReferenceDesc>
        <ExplanationTxt>DESCRIPTION OF PURPOSE: BUILDING IMPROVEMENTS AND EQUIPMENT PURCHASES; REFUND OF 1993 AND 1995 BONDS. SCHEDULE K, PART III: THE INSTITUTE MONITORS THE USE OF BOND-FINANCED FACILITIES AND EQUIPMENT AND HAS DETERMINED THAT IT HAS NO MANAGEMENT OR SERVICE CONTRACTS, RESEARCH CONTRACTS, UNRELATED TRADE OR BUSINESS ACTIVITIES, OR OTHER ACTIVITIES WITH RESPECT TO BOND-FINANCED EQUIPMENT OR FACILITIES THAT WOULD RESULT IN PRIVATE BUSINESS USE. SCHEDULE K, PART IV, COLUMN A, LINE 2C: A REBATE COMPUTATION WAS PERFORMED ON 08/04/2014.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleK>
    <IRS990ScheduleM documentId="IRS990ScheduleM">
      <WorksOfArtGrp />
      <ArtHistoricalTreasuresGrp />
      <ArtFractionalInterestGrp />
      <BooksAndPublicationsGrp />
      <ClothingAndHouseholdGoodsGrp />
      <CarsAndOtherVehiclesGrp />
      <BoatsAndPlanesGrp />
      <IntellectualPropertyGrp />
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>207040</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>SALE PROCEEDS AT FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <SecuritiesCloselyHeldStockGrp />
      <SecurPrtnrshpTrustIntrstsGrp />
      <SecuritiesMiscellaneousGrp />
      <QualifiedContribHistStructGrp />
      <QualifiedContribOtherGrp />
      <RealEstateResidentialGrp />
      <RealEstateCommercialGrp />
      <RealEstateOtherGrp />
      <CollectiblesGrp />
      <FoodInventoryGrp />
      <DrugsAndMedicalSuppliesGrp />
      <TaxidermyGrp />
      <HistoricalArtifactsGrp />
      <ScientificSpecimensGrp />
      <ArchaeologicalArtifactsGrp />
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>false</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE M, COLUMN B:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE IS REPORTING THE NUMBER OF CONTRIBUTIONS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1 &amp; PART III, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>ORGANIZATION'S MISSION: WHITEHEAD INSTITUTE FOR BIOMEDICAL RESEARCH ("THE INSTITUTE") ENGAGES IN BIOMEDICAL RESEARCH AND EDUCATION TO FOSTER THE UNDERSTANDING OF BIOLOGICAL SYSTEMS, ORGANISMS, AND PROCESSES, WITH THE ULTIMATE GOAL OF IMPROVING HUMAN HEALTH AND WELL-BEING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 6:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE DOES NOT FORMALLY TRACK VOLUNTEERS, BUT HAS INCLUDED THE NUMBER OF BOARD MEMBERS AND EXECUTIVE COMMITTEE MEMBERS OF THE BOARD OF ASSOCIATES (FRIENDS OF THE INSTITUTE) THAT ARE UNCOMPENSATED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>JOHN, PETER, AND SUSAN WHITEHEAD (ALL DIRECTORS) HAVE A FAMILY RELATIONSHIP AND A BUSINESS RELATIONSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 4</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING FISCAL YEAR 2018 WHITEHEAD INSTITUTE REVISED ITS BY-LAWS AND ARTICLES OF INCORPORATION. THE REVISIONS SEEK TO ACHIEVE CONSISTENCY ACROSS THE DOCUMENTS AS WELL BRING THEIR DIRECTIVES INTO ALIGNMENT WITH THE CONTEMPORARY AND FORWARD LOOKING FUNCTION OF THE BOARD AND THE OPERATIONS OF THE INSTITUTION. KEY CHANGES INCLUDED DEFINING FOUNDING MEMBERS AND ESTABLISHING TERM LIMITS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 11B:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS FOR THE FORM 990 INCLUDES REVIEW BY SENIOR MANAGEMENT, THE AUDIT COMMITTEE, AND THE INDEPENDENT EXTERNAL TAX CONSULTANTS. THE AUDIT COMMITTEE REVIEWS A DRAFT OF THE RETURN AND THE FULL BOARD RECEIVES A FINAL COPY OF THE FORM 990 BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 12C:</FormAndLineReferenceDesc>
        <ExplanationTxt>PROMPTLY AFTER THE END OF EACH FISCAL YEAR OF THE INSTITUTE (JUNE 30), AND IMMEDIATELY FOLLOWING ELECTION TO THE BOARD, OR AS AN OFFICER, FOR THE FIRST TIME, DIRECTORS AND OFFICERS SHALL SUBMIT TO THE VICE PRESIDENT, OR SUCH PERSON AS THE DIRECTORS MAY DESIGNATE, A COMPLETED DISCLOSURE STATEMENT REPORTING INFORMATION SPECIFICALLY REQUESTED IN THE STATEMENT AND ALSO REPORTING ON BEHALF OF THEMSELVES, THEIR FAMILY MEMBERS, AND ORGANIZATIONS WITH WHICH THEY HAVE A BUSINESS RELATIONSHIP, ANY ACTUAL OR PLANNED BUSINESS OR OTHER TRANSACTION OR RELATIONSHIP THAT DIRECTLY OR INDIRECTLY INVOLVES THE INSTITUTE OR THAT FOR SOME OTHER REASON COULD BE CONSTRUED AS A CONFLICT OF INTEREST BECAUSE IT MIGHT AFFECT THEIR INDEPENDENT, UNBIASED JUDGMENT WHEN CARRYING OUT THEIR DUTIES FOR THE INSTITUTE. IF A MATTER COMES BEFORE THE BOARD OR ANY COMMITTEE OF THE BOARD IN WHICH A DIRECTOR HAS AN INTEREST (EITHER DIRECTLY OR INDIRECTLY), SUCH DIRECTOR SHOULD WITHDRAW FROM DISCUSSION AND VOTING WHEN THE BOARD OR COMMITTEE ACTS ON SUCH MATTER. CONFLICTS OF INTEREST ARE MONITORED BY THE VICE PRESIDENT AND DIRECTOR WHO ADVISE THE CHAIRMAN OF THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 15:</FormAndLineReferenceDesc>
        <ExplanationTxt>A COMPENSATION COMMITTEE OF THE BOARD OF DIRECTORS ANNUALLY REVIEWS AND RECOMMENDS CHANGES TO THE PRESIDENT'S COMPENSATION BASED UPON PERFORMANCE AGAINST MULTI-YEAR GOALS. THE PRESIDENT REVIEWS THE SENIOR MANAGEMENT SALARIES AND REPORTS TO THE BOARD OF DIRECTORS. FACULTY SALARIES ARE SET BY MASSACHUSETTS INSTITUTE OF TECHNOLOGY ON AN ANNUAL BASIS. ALL OTHER OFFICER SALARIES ARE PART OF A RAISE POOL THAT IS DETERMINED ANNUALLY AND APPROVED BY THE BOARD OF DIRECTORS AS PART OF THE BUDGET APPROVAL PROCESS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INSTITUTE'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS OR FUND BALANCES: POST-RETIREMENT RELATED CHANGES: $1,324,295 EARLY RETIREMENT INCENTIVE PROGRAM: - $2,024,680 TOTAL OTHER CHANGES IN NET ASSETS OR FUND BALANCES: $-700,385</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>