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        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John McCarter</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Saul Pannell</PersonNm>
        <TitleTxt>Vice Chair of the Board</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jeffrey Pierce</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>George Putnam</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>William Speck</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>0</OtherCompensationAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Robert Zimmer</PersonNm>
        <TitleTxt>Chair of the Board</TitleTxt>
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        <OfficerInd>X</OfficerInd>
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        <ReportableCompFromRltdOrgAmt>1370965</ReportableCompFromRltdOrgAmt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Katie Callow-Wright</PersonNm>
        <TitleTxt>Secretary of the Corporation</TitleTxt>
        <AverageHoursPerWeekRt>1</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>40.00</AverageHoursPerWeekRltdOrgRt>
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        <OtherCompensationAmt>53119</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Melina Hale</PersonNm>
        <TitleTxt>Interim Co Director of the MBL</TitleTxt>
        <AverageHoursPerWeekRt>10</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>40</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>477453</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>90567</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Mary Harrington</PersonNm>
        <TitleTxt>Treasurer &amp; Director of Finance</TitleTxt>
        <AverageHoursPerWeekRt>40</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>196590</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>50651</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Neil Shubin</PersonNm>
        <TitleTxt>Interim Co Director of the MBL</TitleTxt>
        <AverageHoursPerWeekRt>10</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>40</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>0</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>668066</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>84972</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Paul Speer</PersonNm>
        <TitleTxt>Chief Operating Officer</TitleTxt>
        <AverageHoursPerWeekRt>40</AverageHoursPerWeekRt>
        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
        <OfficerInd>X</OfficerInd>
        <ReportableCompFromOrgAmt>269357</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>58739</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Rae Nishi</PersonNm>
        <TitleTxt>Director of Education</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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        <ReportableCompFromOrgAmt>195794</ReportableCompFromOrgAmt>
        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
        <OtherCompensationAmt>50040</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>David Mark Welch</PersonNm>
        <TitleTxt>Interim Director Bay Paul Center</TitleTxt>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Roger Hanlon</PersonNm>
        <TitleTxt>Director Marine Resource Center</TitleTxt>
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        <OtherCompensationAmt>33535</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jerry Melillo</PersonNm>
        <TitleTxt>Distinguished Scientist</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Marie Russell</PersonNm>
        <TitleTxt>Director of Facilities</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>0</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mitchell Sogin</PersonNm>
        <TitleTxt>Distinguished Scientist</TitleTxt>
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        <AverageHoursPerWeekRltdOrgRt>1</AverageHoursPerWeekRltdOrgRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joshua Rosenthal</PersonNm>
        <TitleTxt>Senior Scientist</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Huntington Willard</PersonNm>
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          <BusinessName>
            <BusinessNameLine1Txt>Sodexo Inc</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 360170</AddressLine1Txt>
            <CityNm>Pittsburgh</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Shawmut Woodworking and Supply</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
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            <AddressLine2Txt>Suite 200</AddressLine2Txt>
            <CityNm>Boston</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02118</ZIPCd>
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        </ContractorAddress>
        <ServicesDesc>Construction services &amp; equipment repair</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>George T Wilkinson Inc</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>405 VFW Drive</AddressLine1Txt>
            <CityNm>Rockland</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02370</ZIPCd>
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        </ContractorAddress>
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      <ContractorCompensationGrp>
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          <BusinessName>
            <BusinessNameLine1Txt>University of Vermont</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 1389</AddressLine1Txt>
            <CityNm>Williston</CityNm>
            <StateAbbreviationCd>VT</StateAbbreviationCd>
            <ZIPCd>05495</ZIPCd>
          </USAddress>
        </ContractorAddress>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>The Regents of the University of Michigan</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>PO Box 223131</AddressLine1Txt>
            <CityNm>Pittsburgh</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>15251</ZIPCd>
          </USAddress>
        </ContractorAddress>
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        <CompensationAmt>148667</CompensationAmt>
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      <FederatedCampaignsAmt>0</FederatedCampaignsAmt>
      <MembershipDuesAmt>10175</MembershipDuesAmt>
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      <TotalContributionsAmt>31402988</TotalContributionsAmt>
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        <Desc>Tuition</Desc>
        <BusinessCd>611600</BusinessCd>
        <TotalRevenueColumnAmt>2123579</TotalRevenueColumnAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>721000</BusinessCd>
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      <ProgramServiceRevenueGrp>
        <Desc>Specimens and research services</Desc>
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        <ExclusionAmt>0</ExclusionAmt>
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      <ProgramServiceRevenueGrp>
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        <BusinessCd>532000</BusinessCd>
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        <ExclusionAmt>797408</ExclusionAmt>
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        <ExclusionAmt>0</ExclusionAmt>
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        <SecuritiesAmt>7073426</SecuritiesAmt>
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        <SecuritiesAmt>2687504</SecuritiesAmt>
        <OtherAmt>40858</OtherAmt>
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        <OtherAmt>112847</OtherAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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        <RelatedOrExemptFuncIncomeAmt>141763</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>0</ExclusionAmt>
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      <TotalRevenueGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <GrantsToDomesticOrgsGrp>
        <TotalAmt>1213839</TotalAmt>
        <ProgramServicesAmt>1213839</ProgramServicesAmt>
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        <ProgramServicesAmt>2020128</ProgramServicesAmt>
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        <ProgramServicesAmt>89906</ProgramServicesAmt>
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      <CompCurrentOfcrDirectorsGrp>
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        <ProgramServicesAmt>441298</ProgramServicesAmt>
        <ManagementAndGeneralAmt>696953</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>14295383</ProgramServicesAmt>
        <ManagementAndGeneralAmt>511960</ManagementAndGeneralAmt>
        <FundraisingAmt>589525</FundraisingAmt>
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        <ProgramServicesAmt>1126809</ProgramServicesAmt>
        <ManagementAndGeneralAmt>43261</ManagementAndGeneralAmt>
        <FundraisingAmt>47917</FundraisingAmt>
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        <ProgramServicesAmt>2851051</ProgramServicesAmt>
        <ManagementAndGeneralAmt>196276</ManagementAndGeneralAmt>
        <FundraisingAmt>118932</FundraisingAmt>
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        <TotalAmt>1281523</TotalAmt>
        <ProgramServicesAmt>1135643</ProgramServicesAmt>
        <ManagementAndGeneralAmt>99113</ManagementAndGeneralAmt>
        <FundraisingAmt>46767</FundraisingAmt>
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      <FeesForServicesLegalGrp>
        <TotalAmt>70038</TotalAmt>
        <ManagementAndGeneralAmt>70038</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>247875</TotalAmt>
        <ManagementAndGeneralAmt>247875</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesLobbyingGrp>
        <TotalAmt>120000</TotalAmt>
        <FundraisingAmt>120000</FundraisingAmt>
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        <TotalAmt>947420</TotalAmt>
        <ProgramServicesAmt>827359</ProgramServicesAmt>
        <ManagementAndGeneralAmt>120061</ManagementAndGeneralAmt>
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        <TotalAmt>2226075</TotalAmt>
        <ProgramServicesAmt>1776482</ProgramServicesAmt>
        <ManagementAndGeneralAmt>381573</ManagementAndGeneralAmt>
        <FundraisingAmt>68020</FundraisingAmt>
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        <ProgramServicesAmt>966974</ProgramServicesAmt>
        <ManagementAndGeneralAmt>5479</ManagementAndGeneralAmt>
        <FundraisingAmt>29045</FundraisingAmt>
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        <ExplanationTxt>The Laboratory is a tax-exempt organization described in Section 501(c)(3) of the Internal Revenue Code, as amended (the Code), and is generally exempt from income taxes pursuant to Section 501(a) of the Code. The Laboratory is required to assess uncertain tax positions and has determined that there were no such positions that are material to the financial statements. Management believes that the Laboratory's income tax returns for years ended prior to 2015 are no longer subject to examination by tax authorities in its major tax jurisdiction. On December 22, 2017, the President signed into law H.R. 1, originally known as the Tax Cuts and Jobs Act. The new law includes several provisions that result in substantial changes to the tax treatment of tax-exempt organizations and their donors. The Laboratory has reviewed these provisions and the potential impact and concluded the enactment of H.R. 1 will not have a material effect on the operations of the organization.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>Former President and Director Huntington Willard terminated employment with the MBL in April 2017. He received severance payments in the amount of $158,654 during calendar year 2017 as shown on Schedule J.</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <FormAndLineReferenceDesc>Schedule M, Part I, Line 32b</FormAndLineReferenceDesc>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>On July 1, 2013 the Laboratory entered into an affiliation agreement with the University of Chicago (the University) located in Chicago, Illinois. Under this affiliation the University became the sole member of the Laboratory. The University of Chicago as sole member has the right to exercise all powers to approve or disapprove of certain fundamental decisions concerning the Corporation.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Prior to filing the Form 990, members of the Executive Committee and Audit Committee of the Laboratory's Board of Trustees were given an opportunity to review portions of the Form 990 relevant to the areas of oversight of those Committees, allowing them to review the form, provide comments, and ask any questions. Subsequent to the Committees' review, the form is made available to the full Board of Trustees for review prior to filing.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>All trustees, officers, senior faculty, senior administrators, and other employees of the Laboratory are subject to conflict of interest policies that among other things, define material financial disclosure of information and specify procedures to be followed in managing these conflicts. The Laboratory's conflict of interest (COI) policies for trustees and officers requires disclosure whenever a trustee or a related party engages in an activity that could be considered a conflict of interest. Trustees are reminded that questions regarding the COI policy may be raised informally and confidentially at any time with the Chair of the Board of Trustees, the Chair of the Nominating and Governance Committee, or the University of Chicago's General Counsel. All trustees must annually disclose actual and potential conflicts of interest by completing a confidential COI Disclosure Statement and Acknowledgement, and these disclosures must be updated as new information becomes available that could affect the trustee's stated interests. The University of Chicago's General Counsel, in consultation with the Nominating and Governance Committee and senior laboratory administration, will compile the disclosures into a confidential database and prepare for each trustee a written acknowledgement of the disclosure that identifies any pending Laboratory transactions that may be affected by the disclosure. The Chair of the Board of Trustees will also review all disclosed potential conflicts of interest before making Board committee assignments. Regardless of these efforts, Trustees must be alert to any and all potential conflicts. To the extent a potential conflict has not been addressed, it should be brought to the immediate attention of the Chair of the Board, the Chair of the Nominating and Governance Committee, or the University of Chicago's General Counsel. The Trustee should also abstain from participating in or voting on the matter. Actions in this regard will be reflected in any official meeting minutes. The Laboratory requires that employees (MBL staff members) complete a COI statement annually. The statement is reviewed by the Director of Human Resources and the Director of the Division of Research. If it is believed there may be a conflict of interest on any of the statements, it is brought to the attention of the MBL Compliance Committee for resolution. Any MBL staff member who is or will be involved in an MBL business transaction in which a potential for conflict of interest may exist is required to report such potential conflict to the Chief Operating Officer. The MBL shall take action to ensure that the transaction, if it is to proceed, is on fair and reasonable terms and in the best interest of the Laboratory. Someone other than the individual with the conflict must initiate the resolutions for action and make the necessary decisions and control the transaction(s). The individual with the conflict must recuse themselves from the decision-making process.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Conflict of Interest policy is available on MBL's website. Audited financial statements and Form 990 are available upon request to organization. In addition, audited financial statements, Form 990, and governing documents are available on public websites and the Commonwealth of Massachusetts' website.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Adjust for non-operating activities: deduct change in value of interest swap rate of $1,290,630, add change in annuities of $58,045, deduct change in post-retirement health care liability of $249,882, deduct non-operating contributions of $365,228, deduct other non-operating activity of $74,289, total of $1,921,984.</ExplanationTxt>
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      <IdRelatedTaxExemptOrgGrp>
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        </DisregardedEntityName>
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          <AddressLine1Txt>55 E Monroe Street</AddressLine1Txt>
          <AddressLine2Txt>20th Floor</AddressLine2Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60603</ZIPCd>
        </USAddress>
        <EIN>362167808</EIN>
        <PrimaryActivitiesTxt>Surveys</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
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          <AddressLine1Txt>1511 East 53rd Street</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60615</ZIPCd>
        </USAddress>
        <EIN>362226282</EIN>
        <PrimaryActivitiesTxt>Community Services</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
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          <CityNm>Chicao</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
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        <EIN>363155157</EIN>
        <PrimaryActivitiesTxt>Library Support</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
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      <IdRelatedTaxExemptOrgGrp>
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          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
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        <EIN>361655190</EIN>
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        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>UChicago Research Bangladesh LTD</BusinessNameLine1Txt>
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          <AddressLine1Txt>House No 388</AddressLine1Txt>
          <AddressLine2Txt>Road 24 1212</AddressLine2Txt>
          <CityNm>Mohakhali</CityNm>
          <ProvinceOrStateNm>Dhaka</ProvinceOrStateNm>
          <CountryCd>BG</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Research</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>BG</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
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          <BusinessNameLine1Txt>UC Research International</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
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          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
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          <AddressLine2Txt>Woolgate Exchange</AddressLine2Txt>
          <CityNm>London</CityNm>
          <CountryCd>UK</CountryCd>
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        <PrimaryActivitiesTxt>Education</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>UK</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
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          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
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        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>University of Chicago Booth School of Business LTD</BusinessNameLine1Txt>
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          <CityNm>Dhoby Ghaut</CityNm>
          <CountryCd>SN</CountryCd>
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        <PrimaryActivitiesTxt>Education</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>SN</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>The University of Chicago FDN in Hong Kong LTD</BusinessNameLine1Txt>
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          <AddressLine1Txt>Far East Ctr c/o Wm Fan and Co</AddressLine1Txt>
          <AddressLine2Txt>Room 100</AddressLine2Txt>
          <CityNm>Hong Kong</CityNm>
          <CountryCd>HK</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Fundraising</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>HK</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>University of Chicago Charter School Corp</BusinessNameLine1Txt>
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        <USAddress>
          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
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        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
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        <PublicCharityStatusTxt>2</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
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        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Cancer Research FDN</BusinessNameLine1Txt>
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          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <EIN>366056201</EIN>
        <PrimaryActivitiesTxt>Supp Research</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>12</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
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        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Center in Paris</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1Txt>6 Rue Thomas Mann 75013</AddressLine1Txt>
          <CityNm>Paris</CityNm>
          <CountryCd>FR</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Education</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>FR</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
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      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>The University of Chicago Cloisters Club</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>1212 E 59th Street</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>Social Club</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Medical Center</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5481 S Maryland Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <EIN>363488183</EIN>
        <PrimaryActivitiesTxt>Hospital</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>3</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Property Holding Corp</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <EIN>366108743</EIN>
        <PrimaryActivitiesTxt>Property Holding</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(C)(2)</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Retiree Medical Trust</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <EIN>363999692</EIN>
        <PrimaryActivitiesTxt>Medical trust</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>12</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Self Insurance Trust</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5801 S Ellis Avenue</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60637</ZIPCd>
        </USAddress>
        <EIN>363020034</EIN>
        <PrimaryActivitiesTxt>Malpractice trust</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>12</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>University of Chicago Trust India</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1Txt>GB 10-12 Clairmont Apts Rest House</AddressLine1Txt>
          <CityNm>Bangalore</CityNm>
          <CountryCd>IN</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Fundraising</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>IN</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>UCMC Community Health and Hospital Division Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>208 South Lasalle Street</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60604</ZIPCd>
        </USAddress>
        <EIN>363181170</EIN>
        <PrimaryActivitiesTxt>Promote and support the health of the community</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>13</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago Medical Center</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>UChicago (Beijing) Consulting Co LTD</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <ForeignAddress>
          <AddressLine1Txt>Unit 1-10 Culture Place</AddressLine1Txt>
          <AddressLine2Txt>Remmin University</AddressLine2Txt>
          <CityNm>Beijing</CityNm>
          <CountryCd>CH</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Consulting</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CH</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <OwnershipPct>1</OwnershipPct>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>UChicago Center in India Private Limited</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <ForeignAddress>
          <AddressLine1Txt>2/11 B Jangpura A</AddressLine1Txt>
          <CityNm>New Delhi</CityNm>
          <CountryCd>IN</CountryCd>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Consulting</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>IN</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <OwnershipPct>0.51</OwnershipPct>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>SC Curriculum Inc</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>70 West Madison Street</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60602</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>Science curriculum</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <OwnershipPct>1</OwnershipPct>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1Txt>Phoenix Overlay Fund Ltd</BusinessNameLine1Txt>
        </RelatedOrganizationName>
        <USAddress>
          <AddressLine1Txt>401 N Michigan Ave</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60611</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>Investing</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>University of Chicago</BusinessNameLine1Txt>
        </DirectControllingEntityName>
        <EntityTypeTxt>C</EntityTypeTxt>
        <OwnershipPct>1</OwnershipPct>
      </IdRelatedOrgTxblCorpTrGrp>
      <ReceiptOfIntAnntsRntsRyltsInd>0</ReceiptOfIntAnntsRntsRyltsInd>
      <GiftGrntOrCapContriToOthOrgInd>1</GiftGrntOrCapContriToOthOrgInd>
      <GiftGrntCapContriFromOthOrgInd>1</GiftGrntCapContriFromOthOrgInd>
      <LoansOrGuaranteesToOtherOrgInd>0</LoansOrGuaranteesToOtherOrgInd>
      <LoansOrGuaranteesFromOthOrgInd>0</LoansOrGuaranteesFromOthOrgInd>
      <DivRelatedOrganizationInd>0</DivRelatedOrganizationInd>
      <AssetSaleToOtherOrgInd>0</AssetSaleToOtherOrgInd>
      <AssetPurchaseFromOtherOrgInd>0</AssetPurchaseFromOtherOrgInd>
      <AssetExchangeInd>0</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>0</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>1</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>1</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>1</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>1</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>1</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>1</TransferFromOtherOrgInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part II</FormAndLineReferenceDesc>
        <ExplanationTxt>The University of Chicago, a 501(c)(3) organization, is the direct controlling organization of the Marine Biological Laboratory Health. For purposes of completeness, the following information is provided: The related organizations listed below are disregarded entities of the University of Chicago: UChicago Argonne LLC - 68-0628477, 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Manage Lab Legal Domicile: Illinois; University of Chicago Foundation Ltd - 98-0525557, 5th FL Alder Castle, 10 Noble, London, United Kingdom Primary Activity: Fundraising Legal Domicile: United Kingdom; Theory and Computing Sciences Building Trust - 51-6596577 - 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Research Building Legal Domicile: Illinois; UChicago Trading - 30-0517735, 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Investing Legal Domicile: Illinois; Maroon Investments LLC - 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Holding Company Legal Domicile: Delaware; UChicago Impact LLC - 61-1682394, 1307 E. 60th Street, Chicago, IL 60637 Primary Activity: Education Legal Domicile: Illinois; Harper Court LLC - 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Holding Company Legal Domicile: Illinois. For purposes of completeness, the entities listed below are disregarded entities of the University of Chicago Medical Center, a related entity: UCMC Community Physicians LLC, 5841 S Maryland Ave., Chicago, IL 60637, EIN:38-3865637, Primary Activity: Physician Services, Legal Domicile: Illinois; University of Chicago Medicine Care Network LLC, 5841 S Maryland Ave., Chicago, IL 60637, EIN:47-4222269, Primary Activity: Healthcare, Legal Domicile: Illinois. Also note: The University of Chicago Medical Center is a less than 50% member in a joint venture with UCMC/SCH Oncology JV LLC, a tax exempt entity, 1850 Silver Cross Blvd, New Lenox, IL 60451, EIN: 32-2436795. The University of Chicago Medicine Care Network, LLC, a disregarded entity of the University of Chicago Medical Center, is the sole member of the following related entities: UCM Care Network Medical Group Inc. 5841 S. Maryland Ave., Chicago, IL 60637 EIN: 47-4221241 Primary Activity: Healthcare Legal Domicile: Illinois; University of Chicago Medicine Care Network Affiliated Physicians LLC, 5841 S. Maryland, Chicago, IL 60637, EIN: 47-4233918 Primary Activity: Healthcare Legal Domicile: Illinois. The following entity is a disregarded entity of UChicago Research International, a related entity: UChicago Research Bangladesh LLC, 5801 S. Ellis Avenue, Chicago, IL 60637 Primary Activity: Support Research Legal Domicile: Illinois.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>