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        <PersonNm>MR MICHAEL BONNEY</PersonNm>
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        <PersonNm>DR ROBERT WEINBERG</PersonNm>
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        <PersonNm>DR HAZEL SIVE</PersonNm>
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        <PersonNm>MS SHARON STANCZAK</PersonNm>
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          <USAddress>
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        <ProgramServicesAmt>8189533</ProgramServicesAmt>
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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. THE TAX CUTS AND JOBS ACT (THE "ACT") WAS ENACTED ON DECEMBER 22, 2017. THE ACT IMPACTS THE INSTITUTE IN SEVERAL WAYS INCLUDING INCREASES TOUNRELATED 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>
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        <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>888450</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>244812</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <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>25848</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARDS</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>MASSACHUSETTS 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>264547</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>78297</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARD</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>71841</CashGrantAmt>
        <ValuationMethodUsedDesc>N/A</ValuationMethodUsedDesc>
        <NonCashAssistanceDesc>N/A</NonCashAssistanceDesc>
        <PurposeOfGrantTxt>RESEARCH SUBAWARD</PurposeOfGrantTxt>
      </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>
    <IRS990ScheduleJ documentId="IRS990ScheduleJ">
      <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>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>374446</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>374446</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MR MARTIN MULLINS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
        <BaseCompensationFilingOrgAmt>392902</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>25000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>18710</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31058</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>10057</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>477727</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR ROBERT WEINBERG</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>300999</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>10454</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31058</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20500</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>363011</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RUDOLF JAENISCH</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>316065</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>12713</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31058</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>20850</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>380686</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR RICHARD YOUNG</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>278903</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>39240</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31058</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>26595</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>375796</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DR HAZEL SIVE</PersonNm>
        <TitleTxt>MEMBER (FACULTY)</TitleTxt>
        <BaseCompensationFilingOrgAmt>253836</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>70746</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>29557</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>26426</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>380565</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS JULIA FANTASIA</PersonNm>
        <TitleTxt>CFO &amp; TREASURER</TitleTxt>
        <BaseCompensationFilingOrgAmt>204035</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>47500</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>670</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>23174</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21567</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>296946</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MS SHARON STANCZAK</PersonNm>
        <TitleTxt>VP Institutional Advancement</TitleTxt>
        <BaseCompensationFilingOrgAmt>270766</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>30000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>4335</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>31058</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>23706</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>359865</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE J, PART I, LINES 1A &amp; 1B:</FormAndLineReferenceDesc>
        <ExplanationTxt>WHITEHEAD INSTITUTE HAS A BOARD COMPENSATION COMMITTEE, WHICH HAS A CHARTER. IN ADDITION, WHITEHEAD HAS AN EXECUTIVE COMPENSATION POLICY. DAVID PAGE'S HOUSING ALLOWANCE IS IN ACCORDANCE WITH THE COMPENSATION COMMITTEE CHARTER AND EXECUTIVE COMPENSATION POLICY.</ExplanationTxt>
      </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 2018. 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 CFO. THE BONUS REPORTED IN COLUMN B(II) FOR MS. SHARON STANCZAK REPRESENTS NON-FIXED PAYMENTS MADE TO MS. SHARON STANCZAK IN RECOGNITION OF WORK PERFORMED IN THE ROLE OF VP OF INSTITUTIONAL ADVANCEMENT OVER TWO PERFORMANCE YEARS. 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>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleK documentId="IRS990ScheduleK">
      <TaxExemptBondsIssuesGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <IssuerName>
          <BusinessNameLine1Txt>MASS DEVELOPMENT FINANCE AGENCY</BusinessNameLine1Txt>
        </IssuerName>
        <BondIssuerEIN>043431814</BondIssuerEIN>
        <CUSIPNum>57583UEV6</CUSIPNum>
        <BondIssuedDt>2011-07-01</BondIssuedDt>
        <IssuePriceAmt>43581560</IssuePriceAmt>
        <PurposeDesc>Capital and Equpment purchases</PurposeDesc>
        <DefeasedInd>false</DefeasedInd>
        <OnBehalfOfIssuerInd>true</OnBehalfOfIssuerInd>
        <PoolFinancingInd>false</PoolFinancingInd>
      </TaxExemptBondsIssuesGrp>
      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <RetiredAmt>11120000</RetiredAmt>
        <BondDefeasedAmt>0</BondDefeasedAmt>
        <TotalProceedsAmt>43581560</TotalProceedsAmt>
        <InReserveFundAmt>0</InReserveFundAmt>
        <CapitalizedInterestAmt>0</CapitalizedInterestAmt>
        <RefundingEscrowAmt>0</RefundingEscrowAmt>
        <IssuanceCostsFromProceedsAmt>581560</IssuanceCostsFromProceedsAmt>
        <CreditEnhancementAmt>0</CreditEnhancementAmt>
        <WorkingCapitalExpendituresAmt>0</WorkingCapitalExpendituresAmt>
        <CapitalExpendituresAmt>10000000</CapitalExpendituresAmt>
        <OtherSpentProceedsAmt>33000000</OtherSpentProceedsAmt>
        <UnspentAmt>0</UnspentAmt>
        <SubstantialCompletionYr>2014</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>false</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>true</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>false</MgmtContractBondFincdPropInd>
        <EngageBondCounselContractsInd>false</EngageBondCounselContractsInd>
        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
        <EngageBondCounselResearchInd>false</EngageBondCounselResearchInd>
        <PrivateBusUseByOthersPct>0.00000</PrivateBusUseByOthersPct>
        <PrivateBusConcerningUBIPct>0.00000</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.00000</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <ChangeInUseBondFinancedPropPct>0.00000</ChangeInUseBondFinancedPropPct>
        <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>
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    <IRS990ScheduleM documentId="IRS990ScheduleM">
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      <ArtHistoricalTreasuresGrp />
      <ArtFractionalInterestGrp />
      <BooksAndPublicationsGrp />
      <ClothingAndHouseholdGoodsGrp />
      <CarsAndOtherVehiclesGrp />
      <BoatsAndPlanesGrp />
      <IntellectualPropertyGrp />
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>3</ContributionCnt>
        <NoncashContributionsRptF990Amt>100199</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>SALE PROCEEDS AT FMV</MethodOfDeterminingRevenuesTxt>
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      <FoodInventoryGrp />
      <DrugsAndMedicalSuppliesGrp />
      <TaxidermyGrp />
      <HistoricalArtifactsGrp />
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      <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 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. AMY SCHULMAN, PHILLIP SHARP AND MICHAEL BONNEY HAVE 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 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER CHANGES IN NET ASSETS OR FUND BALANCES: POST-RETIREMENT RELATED CHANGES: $-765,184 TOTAL OTHER CHANGES IN NET ASSETS OR FUND BALANCES: $-765,184</ExplanationTxt>
      </SupplementalInformationDetail>
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</Return>