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      <Form990PartVIISectionAGrp>
        <PersonNm>MS SUSAN WHITEHEAD</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MS BRIT D'ARBELOFF</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MR JONATHAN GOLDSTEIN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR ROBERT LANGER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
        <AverageHoursPerWeekRt>2.0</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR MARK LAPMAN</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR PHILLIP SHARP</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MR JOHN WHITEHEAD</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MR PETER WHITEHEAD</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DR ROBERT SATCHER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DR PAUL JOSKOW</PersonNm>
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        <OfficerInd>X</OfficerInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MR CHURCHILL FRANKLIN</PersonNm>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DR SUSAN HOCKFIELD</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MS SARAH WILLIAMSON</PersonNm>
        <TitleTxt>DIRECTOR/BOARD CHAIR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>DR DENNIS LANGER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0.0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>MR SETH ALEXANDER</PersonNm>
        <TitleTxt>DIRECTOR</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <TotReportableCompRltdOrgAmt>0</TotReportableCompRltdOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>62</IndivRcvdGreaterThan100KCnt>
      <FormerOfcrEmployeesListedInd>true</FormerOfcrEmployeesListedInd>
      <TotalCompGreaterThan150KInd>true</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>THE INVESTMENT FUND FOR FOUNDATIONS</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>170 N Radnor Chester Rd 300</AddressLine1Txt>
            <CityNm>RADNOR</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19087</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>INVESTMENT MANAGER</ServicesDesc>
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      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>MORSE BARNES-BROWN</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>230 3rd Ave4th Floor</AddressLine1Txt>
            <CityNm>WALTHAM</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02451</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>Salt Creek Catering</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>15 Brewer Lane</AddressLine1Txt>
            <CityNm>READING</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01867</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>catering services</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>PIDC CONSTRUCTION CORP</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>25 BIRCH STREET</AddressLine1Txt>
            <CityNm>MILFORD</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>01757</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <PersonNm>JC CANNISTRARO</PersonNm>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>80 ROSEDALE ROAD</AddressLine1Txt>
            <CityNm>WATERTOWN</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02472</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>CONSTRUCTION</ServicesDesc>
        <CompensationAmt>546493</CompensationAmt>
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      <GovernmentGrantsAmt>14910380</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>13476187</AllOtherContributionsAmt>
      <NoncashContributionsAmt>81623</NoncashContributionsAmt>
      <TotalContributionsAmt>28386567</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>SCIENTIFIC SERVICES</Desc>
        <BusinessCd>541900</BusinessCd>
        <TotalRevenueColumnAmt>1095858</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1095858</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>1095858</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>9187660</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>-103722</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>9291382</ExclusionAmt>
      </InvestmentIncomeGrp>
      <IncmFromInvestBondProceedsGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </IncmFromInvestBondProceedsGrp>
      <RoyaltiesRevenueGrp>
        <TotalRevenueColumnAmt>35097474</TotalRevenueColumnAmt>
        <ExclusionAmt>35097474</ExclusionAmt>
      </RoyaltiesRevenueGrp>
      <GrossRentsGrp>
        <RealAmt>1296983</RealAmt>
      </GrossRentsGrp>
      <LessRentalExpensesGrp>
        <RealAmt>246559</RealAmt>
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      <RentalIncomeOrLossGrp>
        <RealAmt>1050424</RealAmt>
        <PersonalAmt>0</PersonalAmt>
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      <NetRentalIncomeOrLossGrp>
        <TotalRevenueColumnAmt>1050424</TotalRevenueColumnAmt>
        <ExclusionAmt>1050424</ExclusionAmt>
      </NetRentalIncomeOrLossGrp>
      <GrossAmountSalesAssetsGrp>
        <SecuritiesAmt>124481463</SecuritiesAmt>
      </GrossAmountSalesAssetsGrp>
      <LessCostOthBasisSalesExpnssGrp>
        <SecuritiesAmt>102056846</SecuritiesAmt>
      </LessCostOthBasisSalesExpnssGrp>
      <GainOrLossGrp>
        <SecuritiesAmt>22424617</SecuritiesAmt>
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      <NetGainOrLossInvestmentsGrp>
        <TotalRevenueColumnAmt>22424617</TotalRevenueColumnAmt>
        <ExclusionAmt>22424617</ExclusionAmt>
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      <FundraisingDirectExpensesAmt>0</FundraisingDirectExpensesAmt>
      <NetIncmFromFundraisingEvtGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncmFromFundraisingEvtGrp>
      <GamingGrossIncomeAmt>0</GamingGrossIncomeAmt>
      <GamingDirectExpensesAmt>0</GamingDirectExpensesAmt>
      <NetIncomeFromGamingGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncomeFromGamingGrp>
      <GrossSalesOfInventoryAmt>0</GrossSalesOfInventoryAmt>
      <CostOfGoodsSoldAmt>0</CostOfGoodsSoldAmt>
      <NetIncomeOrLossGrp>
        <TotalRevenueColumnAmt>0</TotalRevenueColumnAmt>
      </NetIncomeOrLossGrp>
      <OtherRevenueMiscGrp>
        <Desc>PROCESSING FEES FOR ADMIN ROYALTIES</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>288578</TotalRevenueColumnAmt>
        <ExclusionAmt>288578</ExclusionAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>MISCELLANEOUS INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>72571</TotalRevenueColumnAmt>
        <ExclusionAmt>72571</ExclusionAmt>
      </OtherRevenueMiscGrp>
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      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>97603749</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1095858</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>-103722</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>68225046</ExclusionAmt>
      </TotalRevenueGrp>
      <InfoInScheduleOPartIXInd>X</InfoInScheduleOPartIXInd>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>909821</TotalAmt>
        <ProgramServicesAmt>909821</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <GrantsToDomesticIndividualsGrp>
        <TotalAmt>0</TotalAmt>
      </GrantsToDomesticIndividualsGrp>
      <ForeignGrantsGrp>
        <TotalAmt>0</TotalAmt>
      </ForeignGrantsGrp>
      <BenefitsToMembersGrp>
        <TotalAmt>0</TotalAmt>
      </BenefitsToMembersGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>1501950</TotalAmt>
        <ProgramServicesAmt>362500</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1139450</ManagementAndGeneralAmt>
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      <CompDisqualPersonsGrp>
        <TotalAmt>0</TotalAmt>
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        <ProgramServicesAmt>16970872</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3967025</ManagementAndGeneralAmt>
        <FundraisingAmt>917769</FundraisingAmt>
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        <TotalAmt>2118045</TotalAmt>
        <ProgramServicesAmt>1571773</ProgramServicesAmt>
        <ManagementAndGeneralAmt>463050</ManagementAndGeneralAmt>
        <FundraisingAmt>83222</FundraisingAmt>
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        <ProgramServicesAmt>3691308</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1235414</ManagementAndGeneralAmt>
        <FundraisingAmt>178293</FundraisingAmt>
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      <PayrollTaxesGrp>
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        <ProgramServicesAmt>1162246</ProgramServicesAmt>
        <ManagementAndGeneralAmt>342402</ManagementAndGeneralAmt>
        <FundraisingAmt>61539</FundraisingAmt>
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      <FeesForServicesManagementGrp>
        <TotalAmt>0</TotalAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>1279742</TotalAmt>
        <ProgramServicesAmt>1217537</ProgramServicesAmt>
        <ManagementAndGeneralAmt>62205</ManagementAndGeneralAmt>
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      <FeesForServicesAccountingGrp>
        <TotalAmt>314684</TotalAmt>
        <ManagementAndGeneralAmt>314684</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>0</TotalAmt>
      </FeesForServicesLobbyingGrp>
      <FeesForServicesProfFundraising>
        <TotalAmt>0</TotalAmt>
      </FeesForServicesProfFundraising>
      <FeesForSrvcInvstMgmntFeesGrp>
        <TotalAmt>2130885</TotalAmt>
        <ManagementAndGeneralAmt>2130885</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>935735</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2606730</ManagementAndGeneralAmt>
        <FundraisingAmt>104571</FundraisingAmt>
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        <TotalAmt>22860</TotalAmt>
        <ProgramServicesAmt>18562</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4298</ManagementAndGeneralAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
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        <ProgramServicesAmt>210098</ProgramServicesAmt>
        <ManagementAndGeneralAmt>71176</ManagementAndGeneralAmt>
        <FundraisingAmt>14364</FundraisingAmt>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>269831</ProgramServicesAmt>
        <ManagementAndGeneralAmt>753335</ManagementAndGeneralAmt>
        <FundraisingAmt>8771</FundraisingAmt>
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        <TotalAmt>18749254</TotalAmt>
        <ProgramServicesAmt>18749254</ProgramServicesAmt>
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      <OccupancyGrp>
        <TotalAmt>2036907</TotalAmt>
        <ProgramServicesAmt>1747235</ProgramServicesAmt>
        <ManagementAndGeneralAmt>289672</ManagementAndGeneralAmt>
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      <TravelGrp>
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        <ProgramServicesAmt>13024</ProgramServicesAmt>
        <ManagementAndGeneralAmt>18307</ManagementAndGeneralAmt>
      </TravelGrp>
      <PymtTravelEntrtnmntPubOfclGrp>
        <TotalAmt>0</TotalAmt>
      </PymtTravelEntrtnmntPubOfclGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>46142</TotalAmt>
        <ProgramServicesAmt>40533</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5609</ManagementAndGeneralAmt>
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      <InterestGrp>
        <TotalAmt>3668813</TotalAmt>
        <ProgramServicesAmt>3165819</ProgramServicesAmt>
        <ManagementAndGeneralAmt>502994</ManagementAndGeneralAmt>
      </InterestGrp>
      <PaymentsToAffiliatesGrp>
        <TotalAmt>0</TotalAmt>
      </PaymentsToAffiliatesGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>5721975</TotalAmt>
        <ProgramServicesAmt>4937492</ProgramServicesAmt>
        <ManagementAndGeneralAmt>784483</ManagementAndGeneralAmt>
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      <InsuranceGrp>
        <TotalAmt>386278</TotalAmt>
        <ProgramServicesAmt>333303</ProgramServicesAmt>
        <ManagementAndGeneralAmt>52975</ManagementAndGeneralAmt>
      </InsuranceGrp>
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        <Desc>LAB SUPPLIES</Desc>
        <TotalAmt>9277251</TotalAmt>
        <ProgramServicesAmt>9200470</ProgramServicesAmt>
        <ManagementAndGeneralAmt>76781</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>FELLOWSHIPS</Desc>
        <TotalAmt>3568882</TotalAmt>
        <ProgramServicesAmt>3568882</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>EQUIP PURCH/RENT REPAIR MAIN</Desc>
        <TotalAmt>4891168</TotalAmt>
        <ProgramServicesAmt>3191317</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1682295</ManagementAndGeneralAmt>
        <FundraisingAmt>17556</FundraisingAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>OTHER LAB EXPENSES</Desc>
        <TotalAmt>2630178</TotalAmt>
        <ProgramServicesAmt>2630178</ProgramServicesAmt>
      </OtherExpensesGrp>
      <AllOtherExpensesGrp>
        <TotalAmt>3939343</TotalAmt>
        <ProgramServicesAmt>3082159</ProgramServicesAmt>
        <ManagementAndGeneralAmt>835011</ManagementAndGeneralAmt>
        <FundraisingAmt>22173</FundraisingAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>96726988</TotalAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE C, PART II-B, LINE 1I:</FormAndLineReferenceDesc>
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        <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. .</ExplanationTxt>
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        <RecipientEIN>041564655</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>67041</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </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>5108</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MASS INSTITUTE OF TECHNOLOGY</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>77 MASSACHUSETTS AVE</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
        </USAddress>
        <RecipientEIN>042103634</RecipientEIN>
        <IRCSectionDesc>501(C) (3)</IRCSectionDesc>
        <CashGrantAmt>767939</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>4</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>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <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>true</InitialContractExceptionInd>
      <RebuttablePresumptionProcInd>true</RebuttablePresumptionProcInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RUTH LEHMANN</PersonNm>
        <TitleTxt>DIRECTOR/PRESIDENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>360739</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>5334</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>5139</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>403306</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MR MARTIN MULLINS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>418324</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>25000</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>20460</OtherCompensationFilingOrgAmt>
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        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>505157</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RUDOLF JAENISCH</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>14191</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21127</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>400171</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RICHARD YOUNG</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>294986</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>11311</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>27864</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>366255</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS JULIA FANTASIA</PersonNm>
        <TitleTxt>CFO &amp; TREASURER</TitleTxt>
        <BaseCompensationFilingOrgAmt>248868</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>10000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>828</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>28357</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>22112</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>310165</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR ROBERT WEINBERG</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>314195</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>11025</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20627</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>377941</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS SHARON STANCZAK</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>295785</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>115000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>6299</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>24087</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>473265</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR HARVEY LODISH</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>277445</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>6002</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>32094</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>23377</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>338918</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR IAIN CHEESEMAN</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>259078</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>14646</OtherCompensationFilingOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR MONICA GERBER</PersonNm>
        <TitleTxt>SECRETARY</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>1140</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>13655</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>9279</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>155336</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR DAVID PAGE</PersonNm>
        <TitleTxt>DIRECTOR/PRESIDENT (FORMER)</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>397250</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>397250</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINES 1A &amp; 1B:</FormAndLineReferenceDesc>
        <ExplanationTxt>TRAVEL FOR COMPANIONS INCLUDED TRAVEL EXPENSES PAID FOR FAMILY MEMBERS TO ATTEND AN ANNUAL BUSINESS RETREAT. THESE PAYMENTS WERE TREATED AS TAXABLE INCOME. WHITEHEAD INSTITUTE HAS A BOARD COMPENSATION COMMITTEE, WHICH HAS A CHARTER. IN ADDITION, WHITEHEAD HAS AN EXECUTIVE COMPENSATION POLICY. A FORMER OFFICER'S HOUSING ALLOWANCE IS IN ACCORDANCE WITH THE COMPENSATION COMMITTEE CHARTER AND EXECUTIVE COMPENSATION POLICY. THE ALLOWANCE WAS TREATED AS TAXABLE INCOME.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 7 &amp; PART II, COLUMN (B)(II):</FormAndLineReferenceDesc>
        <ExplanationTxt>BONUS PAYMENTS REPORTED IN COLUMN B(II) REPRESENT NON-FIXED PAYMENTS MADE IN RECOGNITION OF MEETING CERTAIN PERFORMANCE GOALS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINE 8</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PRESIDENT RECEIVED PAYMENTS UNDER AN INITIAL CONTRACT WITH THE INSTITUTE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="IRS990ScheduleL">
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        <PersonNm>RUTH LEHMANN</PersonNm>
        <RelationshipWithOrgTxt>DIRECTOR/PRESIDENT</RelationshipWithOrgTxt>
        <LoanPurposeTxt>MORTGAGE</LoanPurposeTxt>
        <LoanFromOrganizationInd>X</LoanFromOrganizationInd>
        <BalanceDueAmt>1500000</BalanceDueAmt>
        <DefaultInd>false</DefaultInd>
        <BoardOrCommitteeApprovalInd>true</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>true</WrittenAgreementInd>
      </LoansBtwnOrgInterestedPrsnGrp>
      <TotalBalanceDueAmt>1500000</TotalBalanceDueAmt>
    </IRS990ScheduleL>
    <IRS990ScheduleM documentId="IRS990ScheduleM">
      <WorksOfArtGrp />
      <ArtHistoricalTreasuresGrp />
      <ArtFractionalInterestGrp />
      <BooksAndPublicationsGrp />
      <ClothingAndHouseholdGoodsGrp />
      <CarsAndOtherVehiclesGrp />
      <BoatsAndPlanesGrp />
      <IntellectualPropertyGrp />
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>81623</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>SALE PROCEEDS AT FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <SecuritiesCloselyHeldStockGrp />
      <SecurPrtnrshpTrustIntrstsGrp />
      <SecuritiesMiscellaneousGrp />
      <QualifiedContribHistStructGrp />
      <QualifiedContribOtherGrp />
      <RealEstateResidentialGrp />
      <RealEstateCommercialGrp />
      <RealEstateOtherGrp />
      <CollectiblesGrp />
      <FoodInventoryGrp />
      <DrugsAndMedicalSuppliesGrp />
      <TaxidermyGrp />
      <HistoricalArtifactsGrp />
      <ScientificSpecimensGrp />
      <ArchaeologicalArtifactsGrp />
      <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 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 11B:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS FOR THE FORM 990 INCLUDES REVIEW BY SENIOR MANAGEMENT AND THE INDEPENDENT EXTERNAL TAX CONSULTANTS. THE FULL BOARD, INCLUDING THE AUDIT &amp; RISK COMMITTEE 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. BENCHMARK AND INDUSTRY SURVEYS ARE REVIEWED FOR ALL WHITEHEAD POSITIONS.</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 ON AN INDIVIDUAL CASE BASIS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS OR FUND BALANCES: POSTRETIREMENT RELATED CHANGES: $1,924,783 ENDOWMENT CONTRIBUTIONS: $200,000 TOTAL OTHER CHANGES IN NET ASSETS OR FUND BALANCES: $2,124,783</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
