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        <PersonNm>David Hibbitt</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>William Huyett</PersonNm>
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        <PersonNm>Eric Isaacs</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Ethan Lerner</PersonNm>
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        <PersonNm>George Logan</PersonNm>
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        <PersonNm>Walter Massey</PersonNm>
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        <PersonNm>John McCarter</PersonNm>
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        <PersonNm>Ambrose Monell</PersonNm>
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        <PersonNm>Richard Morse</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Dana Ono</PersonNm>
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        <PersonNm>Saul Pannell</PersonNm>
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        <PersonNm>Jeffrey Pierce</PersonNm>
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        <PersonNm>Robert Prendergast</PersonNm>
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        <PersonNm>George Putnam</PersonNm>
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        <PersonNm>Patricia Robertson</PersonNm>
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        <PersonNm>Elise Rose</PersonNm>
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        <PersonNm>Charles Rosenthal</PersonNm>
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        <PersonNm>John Rowe</PersonNm>
        <TitleTxt>Chairman of the Board</TitleTxt>
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        <PersonNm>Walter Salmon</PersonNm>
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        <PersonNm>James Sharp</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Dyann Wirth</PersonNm>
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        <PersonNm>Maureen Nunez</PersonNm>
        <TitleTxt>CFO</TitleTxt>
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        <PersonNm>Jonathan Gitlin</PersonNm>
        <TitleTxt>Deputy Director of Research Programs</TitleTxt>
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        <PersonNm>Christopher Neill</PersonNm>
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        <PersonNm>Mitchell Sogin</PersonNm>
        <TitleTxt>Director Bay Paul Center</TitleTxt>
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        <PersonNm>Roger Hanlon</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen Highstein</PersonNm>
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        <PersonNm>Jerry Melillo</PersonNm>
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        <PersonNm>William Reznikoff</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gaius Shaver</PersonNm>
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        <PersonNm>Joshua Hamilton</PersonNm>
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        <PersonNm>Gary Borisy</PersonNm>
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            <State>PA</State>
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          <BusinessName>
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            <AddressLine1>PO Box 393</AddressLine1>
            <City>Woods Hole</City>
            <State>MA</State>
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          <BusinessName>
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            <State>MA</State>
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      <ProgramServiceRevenueGrp>
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        <ExclusionAmt>946745</ExclusionAmt>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
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      <LessRentalExpensesGrp>
        <RealAmt>0</RealAmt>
        <PersonalAmt>0</PersonalAmt>
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      <RentalIncomeOrLossGrp>
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      <NetRentalIncomeOrLossGrp>
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        <UnrelatedBusinessRevenueAmt>0</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>500000</ExclusionAmt>
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      <NetIncmFromFundraisingEvtGrp>
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        <ExclusionAmt>7575</ExclusionAmt>
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        <ProgramServicesAmt>1402</ProgramServicesAmt>
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        <ProgramServicesAmt>569682</ProgramServicesAmt>
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        <FundraisingAmt>1778</FundraisingAmt>
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        <FundraisingAmt>13774</FundraisingAmt>
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      <SupplementalInformationDetail>
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        <PersonNm>Jerry Melillo</PersonNm>
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      <SupplementalInformationDetail>
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        <Desc>Scientific equipment</Desc>
        <ContributionCnt>2</ContributionCnt>
        <NoncashContributionsRptF990Amt>19024</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Market value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Books</Desc>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>1015</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>Market Value</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <Form8283ReceivedCnt>0</Form8283ReceivedCnt>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>The number in column B shows the number of securities received as donations in 2013.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Lines 25-28</FormAndLineReferenceDesc>
        <ExplanationTxt>The number under contributions for line 25 shows the number of contributors that donated these items.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule M, Part I, Line 32b</FormAndLineReferenceDesc>
        <ExplanationTxt>Stock donations are typically received in the MBL's Morgan Stanley Smith Barney account and typically sold as soon as possible by Morgan Stanley Smith Barney.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="R000012" softwareId="13000241" softwareVersion="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>On July 1, 2013, the Laboratory entered into an affiliation agreement with the University of Chicago (the University) located in Chicago, Illinois. The University of Chicago as sole member has the right to exercise all powers conferred on members of non-profit corporations under Massachusetts General Laws Chapter 180, and also has certain reserved powers to approve or disapprove of certain fundamental decisions concerning the Corporation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <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 conferred on members of non-profit corporations under Massachusetts General Laws Chapter 180, and also has certain reserved powers to approve or disapprove of certain fundamental decisions concerning the Corporation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>The University of Chicago as sole member has the power to appoint and remove members of the Board of Directors.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>The University of Chicago as sole member has the power to take certain actions with respect to the Corporation after prior consultation with the Corporation's Board of Directors, and the power to approve or disapprove certain actions taken by the Corporation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>Form 990 is prepared by the MBL staff and reviewed by Grant Thornton, LLP, the institutions audit and tax services firm. When that review is complete the draft is submitted to the Audit Committee of the Board of Trustees for review. The final version is given to all members of the Board of Trustees at least five(5) days before the filing date.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>PROCESS FOR REVIEW OF TRUSTEE CONFLICT OF INTEREST DISCLOSURES AND COMPLIANCE WITH THE BOARD OF TRUSTEES CONFLICT OF INTEREST POLICY 1. The Chairman of the Board, Vice-Chairman, and the Chairman of the Audit Committee are the trustees responsible for overseeing compliance with the MBL Board of Trustees Conflict of Interest Policy (the Policy). Led by the Chairman of the Board, they shall implement the procedures below. In carrying out their duties they may perform such other inquiry and consult others (including counsel) as, in their sole discretion, they deem appropriate. 2. Without limiting the foregoing, whether or not a particular financial interest or organizational affiliation has been disclosed, if they receive credible information of any kind from any source that an actual or potential conflict exists under the Policy, led by the Chairman of the Board they shall determine whether the allegation merits an inquiry, and if so they shall initiate such inquiry in their sole discretion as they deem appropriate to resolve the matter. At the conclusion of such inquiry, the Chairman of the Audit Committee shall provide a brief report to the Audit Committee, preserving to the maximum extent feasible the confidentiality of the matter. 3. The Director will designate a person in his or her office (the Assistant) to provide support to the Chairman of the Board, Vice-Chairman, and the Chairman of the Audit Committee, in connection with the review of Trustee Conflict of Interest Disclosure Forms and related material documenting Financial Interests and Organizational Affiliations (such documentation for a Trustee being a Disclosure) that may give rise to actual or potential conflicts of interest under the Policy. 4. The Assistant will handle all receipt, communication of, and filing of Disclosures, treating them as confidential information and storing them in a secure location. 5. The filing deadlines under the Policy are 30 days after a trustee's election to the Board, and February 15th of each year. A week before each such filing deadline, the Assistant will inform the Chairman of the Audit Committee of all trustees whose Disclosures have not yet been received, providing phone and email contact information for each such trustee. The Chairman of the Audit Committee will contact those trustees to encourage timely filing. 6. Within five days of each filing deadline the Assistant will inform the Chairman of the Board and, if appropriate, the Vice Chairman of the Board, with copies to the Chairman of the Audit Committee for information purposes, of all trustees whose Disclosures are still missing, for further action by the Chairman of the Board or, if appropriate, the Vice Chairman of the Board. 7. As soon as practical after receiving any Disclosures from a trustee, the Assistant will provide them to the Chairman of the Audit Committee, with the exception of Disclosure by the Chairman of the Audit Committee, which shall be provided to the Chairman of the Board. 8. Promptly upon receipt of these Disclosures, the Chairman of the Audit Committee or, in the case of the Chairman of the Audit Committee's own Disclosure, the Chairman of the Board, shall review them and determine whether any raise issues of actual or potential conflicts under the Policy. Where he/she determines in his judgment that none exist, he/she shall note such finding on those Disclosures, and return them to the Assistant for filing. 9. If the Chairman of the Audit Committee determines that an actual or potential conflict may exist under the Policy, he or she will forward the Disclosure to the Chairman of the Board or, in the case of the Chairman of the Board's own Disclosure, to the Vice Chairman of the Board, for further review and a determination how to address such actual or potential conflict. 10. The Chairman of the Board and, if applicable, the Vice-Chairman of the Board, will review all Disclosures received from the Chairman of the Audit Committee, including the Audit Committee Chairman's own form, and document these reviews and actions taken in a report to Chairman of the Audit Committee. To the extent the question of an actual or potential conflict relates to the Chairman of the Audit Committee, the Chairman shall provide such report to the Vice-Chairman of the Board. He or she will inform the chairmen of committees of the Board of issues related to members of those committees as he judges appropriate. 11. Upon completion of all such reviews, the reviewers will return the Disclosures and all related documentation to the Assistant for filing. 12. The Assistant will maintain a list showing the status of Disclosures of all trustees, and make such list available to the Chairman of the Audit Committee.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Joan Ruderman, President/Director of the MBL, received a salary comparable to the salary received by the former President/Director, approved by the Board. The former President/Director's salary was determined using an independent compensation consultant, compensation study, reviewing the Form 990 of other organizations and was approved by the board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The conflict of interest policy is available on the website. Financial statements are available upon request to the CFO.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Add the $50,000,000 write up for fair value of assets due to the affiliation. Add back $3,171,103 for the interest rate swap, add back $638,409 for the post retirement change, add $40,527 for compensation expense reported on W-2s only. Deduct the PV annuities change of $17,903.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XII, Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>There is a committee of the Board responsible for overseeing the reliability and integrity of the Corporation's financial statements, enterprise risk management and compliance with regulatory requirements.</ExplanationTxt>
      </SupplementalInformationDetail>
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          <BusinessNameLine1>University of Chicago Retiree Medical Trust</BusinessNameLine1>
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          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
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        <EIN>363999692</EIN>
        <PrimaryActivitiesTxt>Medical</PrimaryActivitiesTxt>
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          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
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          <BusinessNameLine1>Chicago Tumor Institute</BusinessNameLine1>
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          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
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        <EIN>237136019</EIN>
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          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1>National Opinion Research Center</BusinessNameLine1>
        </DisregardedEntityName>
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          <AddressLine1>55 E Monroe Stree</AddressLine1>
          <AddressLine2>20th Floor</AddressLine2>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60603</ZIPCode>
        </USAddress>
        <EIN>362167808</EIN>
        <PrimaryActivitiesTxt>Surveys</PrimaryActivitiesTxt>
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          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
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          <BusinessNameLine1>The Quadrangle Club</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801s Ellils Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
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        <EIN>361655190</EIN>
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          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
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          <BusinessNameLine1>Fermi Research Alliance LLC</BusinessNameLine1>
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          <AddressLine1>PO Bpx 500</AddressLine1>
          <City>Batavia</City>
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          <BusinessNameLine1>University of Chicago Prop Holding Corp</BusinessNameLine1>
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          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>University of Chicago FDN in Hong Kong LTD</BusinessNameLine1>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1>16 Harcourt Road</AddressLine1>
          <AddressLine2>Room 1005</AddressLine2>
          <City>Admirality</City>
          <Country>HK</Country>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Fundraising</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>HK</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>UChicago Research International LTD</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>262741573</EIN>
        <PrimaryActivitiesTxt>Research</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>11-TYPE I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>UChicago Research Bangladesh LTD</BusinessNameLine1>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1>House No 388</AddressLine1>
          <AddressLine2>Road 24 1212</AddressLine2>
          <City>Mohakhali</City>
          <ProvinceOrState>Dhaka</ProvinceOrState>
          <Country>BG</Country>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Research</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>BG</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>UC Research International</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>South East Chicago Commission</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>1511 East 53rd Street</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60615</ZIPCode>
        </USAddress>
        <EIN>362226282</EIN>
        <PrimaryActivitiesTxt>Community Services</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>The University of Chicago Cloisters Club</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>c/o 5841 S Maryland Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <PrimaryActivitiesTxt>Social Club</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(7)</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Phoenix Overlay Fund LTD</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>c/o 401 N Michigan Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60611</ZIPCode>
        </USAddress>
        <PrimaryActivitiesTxt>Investing</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CJ</LegalDomicileForeignCountryCd>
        <ExemptCodeSectionTxt>NA</ExemptCodeSectionTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>The John Crerar Foundation</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5730 S Ellis Avenue</AddressLine1>
          <City>Chicao</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>363155157</EIN>
        <PrimaryActivitiesTxt>Library Suport</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>11- TYPE I</PublicCharityStatusTxt>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Chapin Hall Center for Children</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>1313 e 60th Street</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>362167012</EIN>
        <PrimaryActivitiesTxt>Policy Research</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>7</PublicCharityStatusTxt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Hymen Milgrom Supporting Organization</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>33 N Lasalle Street</AddressLine1>
          <AddressLine2>STE 2131</AddressLine2>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60602</ZIPCode>
        </USAddress>
        <EIN>466789522</EIN>
        <PrimaryActivitiesTxt>Education Research</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>VA</LegalDomicileStateCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Maroon Investments LLC</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <PrimaryActivitiesTxt>Holding Company</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Theory and Computing Science Building Trust</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>516596577</EIN>
        <PrimaryActivitiesTxt>Research Building</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Impact LLC</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellils Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>611682394</EIN>
        <PrimaryActivitiesTxt>Education Consulting</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Argonne LLC</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>680628477</EIN>
        <PrimaryActivitiesTxt>Manage Lab</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>UChicago Trading</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>300517735</EIN>
        <PrimaryActivitiesTxt>Investing</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>University of Chicago Foundation Limited (UK)</BusinessNameLine1>
        </DisregardedEntityName>
        <ForeignAddress>
          <AddressLine1>5T FL Alder Caster</AddressLine1>
          <AddressLine2>10 Noble</AddressLine2>
          <City>London</City>
          <Country>UK</Country>
        </ForeignAddress>
        <EIN>980525557</EIN>
        <PrimaryActivitiesTxt>Fundraising</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>UK</LegalDomicileForeignCountryCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>Harper Court LLC</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5801 S Ellis Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <PrimaryActivitiesTxt>Manage property</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1>UCMC Community Physicians LLC</BusinessNameLine1>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1>5481 South Maryland Avenue</AddressLine1>
          <City>Chicago</City>
          <State>IL</State>
          <ZIPCode>60637</ZIPCode>
        </USAddress>
        <EIN>383865637</EIN>
        <PrimaryActivitiesTxt>Physician Services</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>IL</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1>University of Chicago</BusinessNameLine1>
        </DirectControllingEntityName>
      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1>UChicago Center in India Private Limited</BusinessNameLine1>
        </RelatedOrganizationName>
        <ForeignAddress>
          <AddressLine1>2/11 B Jangpura A</AddressLine1>
          <City>New Delhi</City>
          <Country>IN</Country>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Consulting</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>IN</LegalDomicileForeignCountryCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>T</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>0</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>0</ShareOfEOYAssetsAmt>
      </IdRelatedOrgTxblCorpTrGrp>
      <IdRelatedOrgTxblCorpTrGrp>
        <RelatedOrganizationName>
          <BusinessNameLine1>Uchicago (Beijing) Consulting Co LTD</BusinessNameLine1>
        </RelatedOrganizationName>
        <ForeignAddress>
          <AddressLine1>Unit 1-10 Culture Place</AddressLine1>
          <AddressLine2>Remmin University</AddressLine2>
          <City>Beijing</City>
          <Country>CH</Country>
        </ForeignAddress>
        <PrimaryActivitiesTxt>Consulting</PrimaryActivitiesTxt>
        <LegalDomicileForeignCountryCd>CH</LegalDomicileForeignCountryCd>
        <DirectControllingNACd>N/A</DirectControllingNACd>
        <EntityTypeTxt>C</EntityTypeTxt>
        <ShareOfTotalIncomeAmt>0</ShareOfTotalIncomeAmt>
        <ShareOfEOYAssetsAmt>0</ShareOfEOYAssetsAmt>
        <ControlledOrganizationInd>0</ControlledOrganizationInd>
      </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>1</AssetExchangeInd>
      <RentalOfFacilitiesToOthOrgInd>0</RentalOfFacilitiesToOthOrgInd>
      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
      <PerformOfServicesForOthOrgInd>1</PerformOfServicesForOthOrgInd>
      <PerformOfServicesByOtherOrgInd>0</PerformOfServicesByOtherOrgInd>
      <SharingOfFacilitiesInd>0</SharingOfFacilitiesInd>
      <PaidEmployeesSharingInd>0</PaidEmployeesSharingInd>
      <ReimbursementPaidToOtherOrgInd>0</ReimbursementPaidToOtherOrgInd>
      <ReimbursementPaidByOtherOrgInd>0</ReimbursementPaidByOtherOrgInd>
      <TransferToOtherOrgInd>0</TransferToOtherOrgInd>
      <TransferFromOtherOrgInd>0</TransferFromOtherOrgInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule R, Part III</FormAndLineReferenceDesc>
        <ExplanationTxt>For purposes of completion, UCMC is also a member in a joint venture with another tax exempt entity. UCMC/SCH Oncology JV LLC, EIN 32-2436795 provides healthcare services. UCMC does not own more than 50% of the venture and is not the managing member.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleR>
  </ReturnData>
</Return>