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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>LAURA RICHANE</PersonNm>
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        <HighestCompensatedEmployeeInd>X</HighestCompensatedEmployeeInd>
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        <OtherCompensationAmt>36007</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>LOGAN WALSH</PersonNm>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <TotalReportableCompFromOrgAmt>1152940</TotalReportableCompFromOrgAmt>
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      <IndivRcvdGreaterThan100KCnt>8</IndivRcvdGreaterThan100KCnt>
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      <TotalCompGreaterThan150KInd>1</TotalCompGreaterThan150KInd>
      <CompensationFromOtherSrcsInd>0</CompensationFromOtherSrcsInd>
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      <ProgramServiceRevenueGrp>
        <Desc>RESEARCH SUPPORT</Desc>
        <BusinessCd>541700</BusinessCd>
        <TotalRevenueColumnAmt>97174</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>97174</RelatedOrExemptFuncIncomeAmt>
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        <Desc>TUITION REVENUE</Desc>
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        <Desc>OTHER REVENUE</Desc>
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        <FundraisingAmt>53928</FundraisingAmt>
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        <FundraisingAmt>36068</FundraisingAmt>
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        <ProgramServicesAmt>119138</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4151</ManagementAndGeneralAmt>
        <FundraisingAmt>3973</FundraisingAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>24500</ProgramServicesAmt>
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        <ManagementAndGeneralAmt>7595</ManagementAndGeneralAmt>
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      <DepreciationDepletionGrp>
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        <ProgramServicesAmt>483039</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5293</ManagementAndGeneralAmt>
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      <InsuranceGrp>
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        <ProgramServicesAmt>15</ProgramServicesAmt>
        <ManagementAndGeneralAmt>25888</ManagementAndGeneralAmt>
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      <OtherExpensesGrp>
        <Desc>LAB CONSUMABLES</Desc>
        <TotalAmt>279006</TotalAmt>
        <ProgramServicesAmt>265289</ProgramServicesAmt>
        <FundraisingAmt>13717</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>SERVICE POLICIES</Desc>
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        <ProgramServicesAmt>90573</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>REPAIRS AND MAINTENANCE</Desc>
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        <ProgramServicesAmt>63822</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3397</ManagementAndGeneralAmt>
        <FundraisingAmt>1580</FundraisingAmt>
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      <OtherExpensesGrp>
        <Desc>EVENTS EXPENSE</Desc>
        <TotalAmt>30512</TotalAmt>
        <ProgramServicesAmt>22400</ProgramServicesAmt>
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        <FundraisingAmt>3967</FundraisingAmt>
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        <ProgramServicesAmt>3950</ProgramServicesAmt>
        <ManagementAndGeneralAmt>7232</ManagementAndGeneralAmt>
        <FundraisingAmt>34</FundraisingAmt>
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        <ProgramServicesAmt>4305943</ProgramServicesAmt>
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        <EOYAmt>2235648</EOYAmt>
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        <EOYAmt>91643</EOYAmt>
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        <EOYAmt>1405887</EOYAmt>
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      <TotalLiabilitiesGrp>
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        <EOYAmt>1867136</EOYAmt>
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      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
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        <EOYAmt>5000052</EOYAmt>
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      <DonorRestrictionNetAssetsGrp>
        <BOYAmt>3457867</BOYAmt>
        <EOYAmt>6305761</EOYAmt>
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      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>7288429</BOYAmt>
        <EOYAmt>11305813</EOYAmt>
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      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>9194920</BOYAmt>
        <EOYAmt>13172949</EOYAmt>
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      <ReconcilationRevenueExpnssAmt>4017384</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <SeparateBasisFinclStmtInd>X</SeparateBasisFinclStmtInd>
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      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
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        <CurrentTaxYearMinus3YearsAmt>3613857</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4770781</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5507601</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>9715449</CurrentTaxYearAmt>
        <TotalAmt>25741487</TotalAmt>
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      <TotalCalendarYear170Grp>
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        <CurrentTaxYearMinus3YearsAmt>3613857</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4770781</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>5507601</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>9715449</CurrentTaxYearAmt>
        <TotalAmt>25741487</TotalAmt>
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      <SubstantialContributorsTotAmt>541845</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>25199642</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>6006</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>2405</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>15666</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>20017</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>22971</CurrentTaxYearAmt>
        <TotalAmt>67065</TotalAmt>
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      <OtherIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>7399</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>16342</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4146</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>1067</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>8451</CurrentTaxYearAmt>
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      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>OTHER REVENUE - 2020 AMOUNT: $ 7,399. 2021 AMOUNT: $ 16,342. 2022 AMOUNT: $ 3,415. 2023 AMOUNT: $ 630. 2024 AMOUNT: $ 7,896. SWAG REVENUE - 2022 AMOUNT: $ 731. 2023 AMOUNT: $ 437. 2024 AMOUNT: $ 555.</ExplanationTxt>
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    <IRS990ScheduleB documentId="RetDoc1234500001">
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        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
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        <DepreciationAmt>1130170</DepreciationAmt>
        <BookValueAmt>2396744</BookValueAmt>
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      <EquipmentGrp>
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        <BookValueAmt>681161</BookValueAmt>
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      <TotalBookValueLandBuildingsAmt>3077905</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>OPERATING LEASE RIGHT-OF-USE ASSET</Desc>
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      <TotalBookValueOtherAssetsAmt>1361875</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>OPERATING LEASE LIABILITY</Desc>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedAmt>252827</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>9856858</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>9856858</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>6092301</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>252827</DonatedServicesUseFcltsAmt>
      <ExpensesNotReportedAmt>252827</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>5839474</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>5839474</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>GAAP PRESCRIBES THE THRESHOLD A TAX POSITION IS REQUIRED TO MEET BEFORE BEING RECOGNIZED IN THE FINANCIAL STATEMENTS. THE TAX-EXEMPT STATUS OF AN ENTITY IS CONSIDERED A TAX POSITION. AN ADDITIONAL LIABILITY FOR UNCERTAIN TAX POSITIONS ("UTPS") IS RECOGNIZED AND RECORDED AS A COMPONENT OF CURRENT INCOME TAX EXPENSE FOR DIFFERENCES BETWEEN FINANCIAL AND INCOME TAX REPORTING POSITIONS WHICH DO NOT MEET THIS THRESHOLD. ANY INTEREST AND PENALTIES RELATED TO UTPS ARE RECORDED AS A COMPONENT OF INCOME TAX EXPENSE. THE ORGANIZATION HAS REVIEWED ITS INCOME TAX POSITIONS AND HAS NOT IDENTIFIED ANY MATERIAL UTPS, INCLUDING ANY TAX POSITIONS THAT WOULD JEOPARDIZE ITS TAX-EXEMPT STATUS, AND THUS HAS NOT RECORDED A LIABILITY AT DECEMBER 31, 2024 OR 2023. THE ORGANIZATION'S INCOME TAX RETURNS ARE SUBJECT TO EXAMINATION BY TAXING AUTHORITIES. THE ORGANIZATION IS NO LONGER SUBJECT TO EXAMINATIONS BY TAX AUTHORITIES FOR YEARS PRIOR TO 2021. CURRENTLY, THERE ARE NO INCOME TAX AUDITS IN PROCESS.</ExplanationTxt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>BIGELOW LABORATORY FOR OCEAN SCIENCES</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
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          <CityNm>EAST BOOTHBAY</CityNm>
          <StateAbbreviationCd>ME</StateAbbreviationCd>
          <ZIPCd>04544</ZIPCd>
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      <GrantsOtherAsstToIndivInUSGrp>
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        <RecipientCnt>38</RecipientCnt>
        <CashGrantAmt>141260</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>GIFT CARDS AND FOOD TO STUDENTS</GrantTypeTxt>
        <RecipientCnt>17</RecipientCnt>
        <CashGrantAmt>7210</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>RENT ASSISTANCE TO STUDENTS</GrantTypeTxt>
        <RecipientCnt>3</RecipientCnt>
        <CashGrantAmt>5600</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>GRANTS TO ORGANIZATIONS - RESEARCH SUBAWARDS: SUB-AWARDEES ARE INCLUDED IN THE INITIAL PROPOSAL PROCESS FOR THE PRIME AWARD. PAYMENTS TO SUBAWARDEES ARE SENT AFTER THE INSTITUTE RECEIVES AN ITEMIZED INVOICE THAT ALIGNS WITH THE BUDGET. THE INVOICE IS REVIEWED BY THE ORGANIZATION'S DIRECTOR OF SCIENCE PRIOR TO PAYMENT. GRANTS AND ASSISTANCE TO INDIVIDUALS - STUDENT STIPENDS: STUDENTS ARE SELECTED FOR STIPENDS TO HELP WITH LIVING EXPENSES, BASED ON EVIDENCE OF FINANCIAL NEED. STIPENDS ARE AWARDED IN 4 INSTALLMENTS. STUDENTS MUST REMAIN IN THE PROGRAM AND MEET ALL PROGRAM REQUIREMENTS IN ORDER TO RECEIVE PAYMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
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      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
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        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
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        <ExplanationTxt>THE ORGANIZATION IS REPORTING THE NUMBER OF CONTRIBUTORS IN COLUMN (B).</ExplanationTxt>
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        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>DAVID WALT AND MICHELE MAY HAVE A FAMILY RELATIONSHIP. JOHN O'CONNOR AND LAURA SEN HAVE A FAMILY RELATIONSHIP.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS ITS FORM 990 PREPARED BY AN OUTSIDE ACCOUNTING FIRM. THE ORGANIZATION'S AUDITING AND TAX FIRM PRESENTS THE FORM 990 TO THE AUDIT &amp; FINANCE COMMITTEE PROVIDING AN OPPORTUNITY FOR QUESTIONS AND DISCUSSION. A COMPLETE COPY IS PROVIDED TO ALL MEMBERS OF THE ORGANIZATION'S GOVERNING BODY FOR REVIEW PRIOR TO FILING.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS A CONFLICT OF INTEREST POLICY WHICH REQUIRES EACH DIRECTOR, OFFICER AND MEMBER OF COMMITTEE WITH BOARD-DELEGATED POWERS TO ANNUALLY SIGN A CONFLICT OF INTEREST STATEMENT, DISCLOSING ANY POTENTIAL CONFLICTS OF INTEREST. IN CONNECTION WITH ANY ACTUAL OR POSSIBLE CONFLICT OF INTEREST, AN INTERESTED PERSON MUST DISCLOSE THE ALL MATERIAL FACTS TO THE BOARD OF DIRECTORS OR COMMITTEE CONSIDERING THE PROPOSED TRANSACTION OR ARRANGEMENT. AFTER SUCH DISCLOSURE AND ANY DISCUSSION WITH THE INTERESTED PERSON, HE/SHE LEAVES THE BOARD OR COMMITTEE MEETING WHILE THE DETERMINATION OF A CONFLICT OF INTEREST IS DISCUSSED AND VOTED UPON. THE REMAINING BOARD OR COMMITTEE MEMBERS DECIDE IF A CONFLICT OF INTEREST EXISTS, AND HOW TO PROCEED REGARDING THE TRANSACTION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PROCESS FOR DETERMINING THE COMPENSATION OF THE EXECUTIVE DIRECTOR AND THE SCIENCE DIRECTOR INCLUDED A REVIEW AND APPROVAL BY A COMMITTEE OF BOARD MEMBERS, WHO REVIEWED COMPARABILITY DATA, INCLUDING SALARY SURVEYS. THE DELIBERATION AND DECISION WERE CONTEMPORANEOUSLY DOCUMENTED IN THE MEETING MINUTES. THE PROCESS LAST OCCURRED IN 2024.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION MAKES ITS GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS AVAILABLE TO THE PUBLIC UPON REQUEST. THE FINANCIAL STATEMENTS ARE ALSO AVAILABLE ON THE MASSACHUSETTS ATTORNEY GENERAL NONPROFIT ORGANIZATIONS / PUBLIC CHARITIES DIVISION WEBSITE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS A COMMITTEE THAT ASSUMES RESPONSIBILITY FOR OVERSIGHT OF THE AUDIT OF ITS FINANCIAL STATEMENTS. THE FULL BOARD OF DIRECTORS ASSUMES RESPONSIBILITY FOR THE SELECTION OF THE INDEPENDENT ACCOUNTANT. THE PROCESS HAS NOT CHANGED FROM THE PRIOR YEAR.</ExplanationTxt>
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