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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Kevin Churchwell MD</PersonNm>
        <TitleTxt>President &amp; Trustee</TitleTxt>
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        <DeferredCompRltdOrgsAmt>29700</DeferredCompRltdOrgsAmt>
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        <NontaxableBenefitsRltdOrgsAmt>105559</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>3197892</TotalCompensationRltdOrgsAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Douglas Vanderslice</PersonNm>
        <TitleTxt>Treasurer &amp; Trustee</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Michele Garvin Esq</PersonNm>
        <TitleTxt>Clerk &amp; Trustee (END 10/16/23)</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>768780</CompensationBasedOnRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sandra Fenwick</PersonNm>
        <TitleTxt>Former President &amp; Trustee</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Christopher Viney JD</PersonNm>
        <TitleTxt>Clerk &amp; Trustee (BEGIN 10/16/23)</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>114425</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>60000</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>437</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Children's Hospital Corporation, a related organization, made contributions to the supplemental non-qualified retirement plan for the individuals listed below. Contribution amounts are generally based on a percentage of compensation. Participants of the supplemental executive retirement plan are fully vested. All payments with respect to a participant's separation from service will be made in a single sum following the separation from service unless participant has elected to receive the accrued interest portion of his or her account in three annual installments. Contributions were for Children's Hospital Corporation employee benefits and not for Blood Research Institute, Inc. Trustee or Officer of the Board services and/or responsibilities. During calendar year 2023, Children's Hospital Corporation made contributions to the supplemental non-qualified retirement plan for the individuals below: Kevin Churchwell, MD received a contribution of $482,116 Douglas Vanderslice received a contribution of $246,666 Michele Garvin received a contribution of $123,124 During calendar year 2023, the following individual received supplemental executive retirement plan distributions from Children's Hospital Corporation: Sandra Fenwick received a distribution of $939,289</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II</FormAndLineReferenceDesc>
        <ExplanationTxt>Compensation is for Children's Hospital Corporation's executive/employee services; not for Blood Research Institute, Inc. Trustee or Officer of the Board services.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>Children's Medical Center Corporation is the sole member of Blood Research Institute.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7a</FormAndLineReferenceDesc>
        <ExplanationTxt>Children's Medical Center Corporation, as the sole member of Blood Research Institute, elects the governing body of the Organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, line 7b</FormAndLineReferenceDesc>
        <ExplanationTxt>Children's Medical Center Corporation is the sole member of Blood Research Institute and has the right to elect directors and other powers and rights as vested in them by law, the articles of organization or the By-Laws of the organization.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>The Form 990 was prepared by the staff of the Children's Hospital Corporation. The Form 990 was then provided to the Treasurer for review.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12</FormAndLineReferenceDesc>
        <ExplanationTxt>Currently Blood Research Institute, Inc. has no conflict of interest policy. The Officers and Trustees of Blood Research Institute are also Officers and Trustees of the sole member, Children's Medical Center Corporation, and annually discloses any conflicts of interest under the Children's Medical Center Corporation's conflict of interest policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>Blood Research Institute, Inc. does not have any employees and does not compensate its Trustees or Officers of the Board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization's governing documents, audited financial statements, and Form 990 are available upon request. The Organization's Form 990 is also available at the website of Massachusetts' Attorney General.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VII, Section A</FormAndLineReferenceDesc>
        <ExplanationTxt>The individuals, who have compensation from related organizations, listed in Column E, spend the remainder of their full time hours working for Children's Medical Center and its other affiliates.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part I, Line 4 and VI, Line 1b - Governing Body &amp; Management</FormAndLineReferenceDesc>
        <ExplanationTxt>The filing organization has one independent member of the governing body. The other members of the governing body are compensated by a related organization. However, the filing organization is part of an integrated delivery system of organizations, including Children's Hospital that has community boards.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
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        <DisregardedEntityName>
          <BusinessNameLine1Txt>Children's Medical Center Corporation</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>041174680</EIN>
        <PrimaryActivitiesTxt>Holds &amp; manages securities &amp; real estate investments for subsidiaries</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
        <ExemptCodeSectionTxt>501(c)(3)</ExemptCodeSectionTxt>
        <PublicCharityStatusTxt>Line 12b, II</PublicCharityStatusTxt>
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      </IdRelatedTaxExemptOrgGrp>
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          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>042774441</EIN>
        <PrimaryActivitiesTxt>Pediatric healthcare, education and research hospital</PrimaryActivitiesTxt>
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        </DirectControllingEntityName>
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      </IdRelatedTaxExemptOrgGrp>
      <IdRelatedTaxExemptOrgGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>CHB Properties Inc</BusinessNameLine1Txt>
        </DisregardedEntityName>
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          <AddressLine1Txt>300 Longwood Avenue</AddressLine1Txt>
          <CityNm>Boston</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02115</ZIPCd>
        </USAddress>
        <EIN>043323330</EIN>
        <PrimaryActivitiesTxt>Holds &amp; manages satellite ambulatory centers; real estate investments</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MA</LegalDomicileStateCd>
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          <StateAbbreviationCd>MA</StateAbbreviationCd>
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      <IdRelatedTaxExemptOrgGrp>
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          <BusinessNameLine1Txt>Franciscan Hospital for Children Inc</BusinessNameLine1Txt>
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          <CityNm>Brighton</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02135</ZIPCd>
        </USAddress>
        <EIN>042156082</EIN>
        <PrimaryActivitiesTxt>Pediatric rehabiliation and behavioral health</PrimaryActivitiesTxt>
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        <PublicCharityStatusTxt>Line 3</PublicCharityStatusTxt>
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      <IdRelatedOrgTxblCorpTrGrp>
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          <CityNm>Brighton</CityNm>
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      <AssetExchangeInd>0</AssetExchangeInd>
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      <RentalOfFcltsFromOthOrgInd>0</RentalOfFcltsFromOthOrgInd>
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  </ReturnData>
</Return>