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            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02116</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>JANITORIAL SERVICES</ServicesDesc>
        <CompensationAmt>483575</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>EMCOR SERVICES NORTHEAST INC</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>55 GERBER RD EAST</AddressLine1Txt>
            <CityNm>SOUTH WINDSOR</CityNm>
            <StateAbbreviationCd>CT</StateAbbreviationCd>
            <ZIPCd>06074</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>HVAC</ServicesDesc>
        <CompensationAmt>141167</CompensationAmt>
      </ContractorCompensationGrp>
      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>PERKINS &amp; WILL</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>225 FRANKLIN ST SUITE 1100</AddressLine1Txt>
            <CityNm>BOSTON</CityNm>
            <StateAbbreviationCd>MA</StateAbbreviationCd>
            <ZIPCd>02110</ZIPCd>
          </USAddress>
        </ContractorAddress>
        <ServicesDesc>ARCHITECTURAL SERVICES</ServicesDesc>
        <CompensationAmt>138250</CompensationAmt>
      </ContractorCompensationGrp>
      <CntrctRcvdGreaterThan100KCnt>7</CntrctRcvdGreaterThan100KCnt>
      <GovernmentGrantsAmt>83906</GovernmentGrantsAmt>
      <AllOtherContributionsAmt>6138749</AllOtherContributionsAmt>
      <NoncashContributionsAmt>1317345</NoncashContributionsAmt>
      <TotalContributionsAmt>6222655</TotalContributionsAmt>
      <ProgramServiceRevenueGrp>
        <Desc>INCUBATOR INCOME</Desc>
        <BusinessCd>541380</BusinessCd>
        <TotalRevenueColumnAmt>13897538</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>13897538</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>MANAGEMENT FEE</Desc>
        <BusinessCd>561000</BusinessCd>
        <TotalRevenueColumnAmt>1219856</TotalRevenueColumnAmt>
        <UnrelatedBusinessRevenueAmt>1219856</UnrelatedBusinessRevenueAmt>
      </ProgramServiceRevenueGrp>
      <ProgramServiceRevenueGrp>
        <Desc>HARVARD LIFE LAB SERVICES</Desc>
        <BusinessCd>541380</BusinessCd>
        <TotalRevenueColumnAmt>1164620</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>1164620</RelatedOrExemptFuncIncomeAmt>
      </ProgramServiceRevenueGrp>
      <TotalProgramServiceRevenueAmt>16282014</TotalProgramServiceRevenueAmt>
      <InvestmentIncomeGrp>
        <TotalRevenueColumnAmt>87946</TotalRevenueColumnAmt>
        <ExclusionAmt>87946</ExclusionAmt>
      </InvestmentIncomeGrp>
      <OtherRevenueMiscGrp>
        <Desc>EVENT REVENUE</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>31386</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>31386</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>CCRCT</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>4910</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>4910</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueMiscGrp>
        <Desc>OTHER INCOME</Desc>
        <BusinessCd>900099</BusinessCd>
        <TotalRevenueColumnAmt>705</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>705</RelatedOrExemptFuncIncomeAmt>
      </OtherRevenueMiscGrp>
      <OtherRevenueTotalAmt>37001</OtherRevenueTotalAmt>
      <TotalRevenueGrp>
        <TotalRevenueColumnAmt>22629616</TotalRevenueColumnAmt>
        <RelatedOrExemptFuncIncomeAmt>15099159</RelatedOrExemptFuncIncomeAmt>
        <UnrelatedBusinessRevenueAmt>1219856</UnrelatedBusinessRevenueAmt>
        <ExclusionAmt>87946</ExclusionAmt>
      </TotalRevenueGrp>
      <GrantsToDomesticOrgsGrp>
        <TotalAmt>61571</TotalAmt>
        <ProgramServicesAmt>61571</ProgramServicesAmt>
      </GrantsToDomesticOrgsGrp>
      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>877180</TotalAmt>
        <ProgramServicesAmt>616488</ProgramServicesAmt>
        <ManagementAndGeneralAmt>260692</ManagementAndGeneralAmt>
      </CompCurrentOfcrDirectorsGrp>
      <OtherSalariesAndWagesGrp>
        <TotalAmt>5607726</TotalAmt>
        <ProgramServicesAmt>3941145</ProgramServicesAmt>
        <ManagementAndGeneralAmt>1666581</ManagementAndGeneralAmt>
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      <PensionPlanContributionsGrp>
        <TotalAmt>398999</TotalAmt>
        <ProgramServicesAmt>326046</ProgramServicesAmt>
        <ManagementAndGeneralAmt>72953</ManagementAndGeneralAmt>
      </PensionPlanContributionsGrp>
      <OtherEmployeeBenefitsGrp>
        <TotalAmt>1711217</TotalAmt>
        <ProgramServicesAmt>1398339</ProgramServicesAmt>
        <ManagementAndGeneralAmt>312878</ManagementAndGeneralAmt>
      </OtherEmployeeBenefitsGrp>
      <PayrollTaxesGrp>
        <TotalAmt>620466</TotalAmt>
        <ProgramServicesAmt>506703</ProgramServicesAmt>
        <ManagementAndGeneralAmt>113763</ManagementAndGeneralAmt>
      </PayrollTaxesGrp>
      <FeesForServicesLegalGrp>
        <TotalAmt>48539</TotalAmt>
        <ProgramServicesAmt>31162</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17377</ManagementAndGeneralAmt>
      </FeesForServicesLegalGrp>
      <FeesForServicesAccountingGrp>
        <TotalAmt>64525</TotalAmt>
        <ProgramServicesAmt>41425</ProgramServicesAmt>
        <ManagementAndGeneralAmt>23100</ManagementAndGeneralAmt>
      </FeesForServicesAccountingGrp>
      <FeesForServicesOtherGrp>
        <TotalAmt>472050</TotalAmt>
        <ProgramServicesAmt>303057</ProgramServicesAmt>
        <ManagementAndGeneralAmt>168993</ManagementAndGeneralAmt>
      </FeesForServicesOtherGrp>
      <AdvertisingGrp>
        <TotalAmt>437703</TotalAmt>
        <ProgramServicesAmt>279075</ProgramServicesAmt>
        <ManagementAndGeneralAmt>158628</ManagementAndGeneralAmt>
      </AdvertisingGrp>
      <OfficeExpensesGrp>
        <TotalAmt>494857</TotalAmt>
        <ProgramServicesAmt>494907</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-50</ManagementAndGeneralAmt>
      </OfficeExpensesGrp>
      <InformationTechnologyGrp>
        <TotalAmt>352409</TotalAmt>
        <ProgramServicesAmt>10956</ProgramServicesAmt>
        <ManagementAndGeneralAmt>341453</ManagementAndGeneralAmt>
      </InformationTechnologyGrp>
      <OccupancyGrp>
        <TotalAmt>4732863</TotalAmt>
        <ProgramServicesAmt>4463936</ProgramServicesAmt>
        <ManagementAndGeneralAmt>268927</ManagementAndGeneralAmt>
      </OccupancyGrp>
      <TravelGrp>
        <TotalAmt>24934</TotalAmt>
        <ProgramServicesAmt>26739</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-1805</ManagementAndGeneralAmt>
      </TravelGrp>
      <ConferencesMeetingsGrp>
        <TotalAmt>144003</TotalAmt>
        <ProgramServicesAmt>154427</ProgramServicesAmt>
        <ManagementAndGeneralAmt>-10424</ManagementAndGeneralAmt>
      </ConferencesMeetingsGrp>
      <DepreciationDepletionGrp>
        <TotalAmt>2767398</TotalAmt>
        <ProgramServicesAmt>2698213</ProgramServicesAmt>
        <ManagementAndGeneralAmt>69185</ManagementAndGeneralAmt>
      </DepreciationDepletionGrp>
      <InsuranceGrp>
        <TotalAmt>141816</TotalAmt>
        <ProgramServicesAmt>30696</ProgramServicesAmt>
        <ManagementAndGeneralAmt>111120</ManagementAndGeneralAmt>
      </InsuranceGrp>
      <OtherExpensesGrp>
        <Desc>LAB SUPPLIES &amp; CONSUMAB</Desc>
        <TotalAmt>898811</TotalAmt>
        <ProgramServicesAmt>898307</ProgramServicesAmt>
        <ManagementAndGeneralAmt>504</ManagementAndGeneralAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>REPAIRS &amp; MAINTENANCE</Desc>
        <TotalAmt>737799</TotalAmt>
        <ProgramServicesAmt>737799</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>ENVIRONMENTAL SVCS &amp; PE</Desc>
        <TotalAmt>590437</TotalAmt>
        <ProgramServicesAmt>590437</ProgramServicesAmt>
      </OtherExpensesGrp>
      <OtherExpensesGrp>
        <Desc>PROVISION FOR INCOME TA</Desc>
        <TotalAmt>342500</TotalAmt>
        <ProgramServicesAmt>325376</ProgramServicesAmt>
        <ManagementAndGeneralAmt>17124</ManagementAndGeneralAmt>
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      <AllOtherExpensesGrp>
        <TotalAmt>124391</TotalAmt>
        <ProgramServicesAmt>120086</ProgramServicesAmt>
        <ManagementAndGeneralAmt>4305</ManagementAndGeneralAmt>
      </AllOtherExpensesGrp>
      <TotalFunctionalExpensesGrp>
        <TotalAmt>21652194</TotalAmt>
        <ProgramServicesAmt>18056890</ProgramServicesAmt>
        <ManagementAndGeneralAmt>3595304</ManagementAndGeneralAmt>
        <FundraisingAmt>0</FundraisingAmt>
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      <CashNonInterestBearingGrp>
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        <EOYAmt>18486924</EOYAmt>
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      <AccountsReceivableGrp>
        <BOYAmt>4245382</BOYAmt>
        <EOYAmt>1853939</EOYAmt>
      </AccountsReceivableGrp>
      <PrepaidExpensesDefrdChargesGrp>
        <BOYAmt>796938</BOYAmt>
        <EOYAmt>1444990</EOYAmt>
      </PrepaidExpensesDefrdChargesGrp>
      <LandBldgEquipCostOrOtherBssAmt>26114916</LandBldgEquipCostOrOtherBssAmt>
      <LandBldgEquipAccumDeprecAmt>13868263</LandBldgEquipAccumDeprecAmt>
      <LandBldgEquipBasisNetGrp>
        <BOYAmt>13301198</BOYAmt>
        <EOYAmt>12246653</EOYAmt>
      </LandBldgEquipBasisNetGrp>
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        <BOYAmt>12495150</BOYAmt>
        <EOYAmt>78357884</EOYAmt>
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      <TotalAssetsGrp>
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        <EOYAmt>112390390</EOYAmt>
      </TotalAssetsGrp>
      <AccountsPayableAccrExpnssGrp>
        <BOYAmt>11231722</BOYAmt>
        <EOYAmt>1473372</EOYAmt>
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      <DeferredRevenueGrp>
        <BOYAmt>2830791</BOYAmt>
        <EOYAmt>4882112</EOYAmt>
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      <OtherLiabilitiesGrp>
        <BOYAmt>6805191</BOYAmt>
        <EOYAmt>81888363</EOYAmt>
      </OtherLiabilitiesGrp>
      <TotalLiabilitiesGrp>
        <BOYAmt>20867704</BOYAmt>
        <EOYAmt>88243847</EOYAmt>
      </TotalLiabilitiesGrp>
      <OrganizationFollowsFASB117Ind>X</OrganizationFollowsFASB117Ind>
      <NoDonorRestrictionNetAssetsGrp>
        <BOYAmt>22779113</BOYAmt>
        <EOYAmt>24146543</EOYAmt>
      </NoDonorRestrictionNetAssetsGrp>
      <TotalNetAssetsFundBalanceGrp>
        <BOYAmt>22779113</BOYAmt>
        <EOYAmt>24146543</EOYAmt>
      </TotalNetAssetsFundBalanceGrp>
      <TotLiabNetAssetsFundBalanceGrp>
        <BOYAmt>43646817</BOYAmt>
        <EOYAmt>112390390</EOYAmt>
      </TotLiabNetAssetsFundBalanceGrp>
      <ReconcilationRevenueExpnssAmt>977422</ReconcilationRevenueExpnssAmt>
      <DonatedServicesAndUseFcltsAmt>390008</DonatedServicesAndUseFcltsAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <InfoInScheduleOPartXIIInd>X</InfoInScheduleOPartXIIInd>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>1</FSAuditedInd>
      <FSAuditedBasisGrp>
        <ConsolidatedBasisFinclStmtInd>X</ConsolidatedBasisFinclStmtInd>
      </FSAuditedBasisGrp>
      <AuditCommitteeInd>1</AuditCommitteeInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>4140378</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>4949591</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5345306</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>6081659</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>6222656</CurrentTaxYearAmt>
        <TotalAmt>26739590</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>4140378</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>4949591</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>5345306</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>6081659</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>6222656</CurrentTaxYearAmt>
        <TotalAmt>26739590</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>3589918</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>23149672</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>76135</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>128341</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>78720</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>44818</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>87946</CurrentTaxYearAmt>
        <TotalAmt>415960</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <UnrelatedBusinessNetIncm170Grp>
        <CurrentTaxYearMinus4YearsAmt>12267488</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>7119461</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>504780</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>588896</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>1219856</CurrentTaxYearAmt>
        <TotalAmt>21700481</TotalAmt>
      </UnrelatedBusinessNetIncm170Grp>
      <OtherIncome170Grp>
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        <CurrentTaxYearMinus3YearsAmt>95865</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>854642</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>103065</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>37001</CurrentTaxYearAmt>
        <TotalAmt>1206172</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>50062203</TotalSupportAmt>
      <PublicSupportCY170Pct>0.46240</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.50520</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
      <Form990ScheduleAPartVIGrp>
        <FormAndLineReferenceDesc>SCHEDULE A, PART II, LINE 10, EXPLANATION OF OTHER INCOME:</FormAndLineReferenceDesc>
        <ExplanationTxt>EVENT REVENUE - 2018 AMOUNT: $ 115,599. 2019 AMOUNT: $ 95,865. 2020 AMOUNT: $ 17,152. 2021 AMOUNT: $ 15,582. 2022 AMOUNT: $ 31,386. OTHER REVENUE - 2020 AMOUNT: $ 727,730. 2022 AMOUNT: $ 705. CCRCT - 2020 AMOUNT: $ 109,760. 2021 AMOUNT: $ 87,483. 2022 AMOUNT: $ 4,910.</ExplanationTxt>
      </Form990ScheduleAPartVIGrp>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001">
      <ContributorInformationGrp>
        <ContributorNum>RESTRICTED</ContributorNum>
        <ContributorBusinessName>
          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
          <AddressLine1>RESTRICTED</AddressLine1>
          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
        </ContributorUSAddress>
        <TotalContributionsAmt>RESTRICTED</TotalContributionsAmt>
      </ContributorInformationGrp>
    </IRS990ScheduleB>
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>15811520</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>6276166</DepreciationAmt>
        <BookValueAmt>9535354</BookValueAmt>
      </LeaseholdImprovementsGrp>
      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>8338206</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>5910996</DepreciationAmt>
        <BookValueAmt>2427210</BookValueAmt>
      </EquipmentGrp>
      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>1965190</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1681101</DepreciationAmt>
        <BookValueAmt>284089</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>12246653</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>SECURITY DEPOSIT</Desc>
        <BookValueAmt>864182</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>OTHER ASSETS</Desc>
        <BookValueAmt>120000</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>DUE FROM INTERCOMPANY</Desc>
        <BookValueAmt>8032917</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>INVESTMENT IN SUBSIDIARY</Desc>
        <BookValueAmt>6000000</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>RIGHT OF USE</Desc>
        <BookValueAmt>63340785</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>78357884</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>TENANT DEPOSITS</Desc>
        <Amt>1328476</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>RECOVERABLE GRANT</Desc>
        <Amt>5000000</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>TENANT DEPOSITS LAB SUPPLIES</Desc>
        <Amt>297330</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>LEASE LONG TERM</Desc>
        <Amt>72507503</Amt>
      </OtherLiabilitiesOrgGrp>
      <OtherLiabilitiesOrgGrp>
        <Desc>SHORT TERM LEASE</Desc>
        <Amt>2755054</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>81888363</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>LABCENTRAL IS EXEMPT FROM FEDERAL INCOME TAXES UNDER SECTION 501(C)(3) OF THE INTERNAL REVENUE CODE HAVING RECEIVED FAVORABLE DETERMINATION OF ITS STATUS FROM THE IRS IN A LETTER DATED JUNE 26, 2014. MAINSTPBC IS REQUIRED TO FILE CORPORATE INCOME TAX RETURNS UNDER FEDERAL AND MASSACHUSETTS TAX LAW EVEN IF THERE IS NO ACTIVITY. MASSACHUSETTS ALSO REQUIRES ALL CORPORATIONS TO PAY A MINIMUM TAX IF ACTUAL TAX IS LOWER THAN THE MINIMUM. LAB CENTRAL RECEIVES MANAGEMENT FEES FROM MAINSTPBC IN AN AMOUNT IN EXCESS OF ALLOCATED EXPENSES. THIS REPRESENTS AN UNRELATED BUSINESS ACTIVITY AND REQUIRES LAB CENTRAL TO FILE FORM 990-T EXEMPT ORGANIZATION BUSINESS INCOME TAX RETURN. LAB CENTRAL HAS GENERATED NET TAXABLE INCOME AND HAS PROVIDED FOR FEDERAL AND STATE INCOME TAXES. FOR FEDERAL AND STATE INCOME TAXES, DEFERRED TAX ASSETS AND LIABILITIES ARE RECOGNIZED BASED UPON TEMPORARY DIFFERENCES BETWEEN THE FINANCIAL STATEMENT AND THE TAX BASIS OF ASSETS AND LIABILITIES. DEFERRED INCOME TAXES ARE BASED UPON PRESCRIBED RATES AND ENACTED LAWS APPLICABLE TO PERIODS IN WHICH DIFFERENCES ARE EXPECTED TO REVERSE. THE COMPANY FOLLOWS ACCOUNTING GUIDANCE REGARDING RECOGNITION, MEASUREMENT, PRESENTATION, AND DISCLOSURE OF UNCERTAIN TAX POSITIONS IN THE FINANCIAL STATEMENTS. TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN IN THE COURSE OF PREPARING THE COMPANY'S TAX RETURNS, INCLUDING THE POSITION THAT THE COMPANY QUALIFIES AS A TAX EXEMPT ENTITY, ARE REQUIRED TO BE EVALUATED TO DETERMINE WHETHER THE TAX POSITIONS ARE "MORE-LIKELY-THAN-NOT" TO BE UPHELD UNDER REGULATORY REVIEW. MANAGEMENT HAS ANALYZED THE TAX POSITIONS TAKEN BY THE COMPANY, AND HAS CONCLUDED THAT AS OF DECEMBER 31, 2022, THERE ARE NO UNCERTAIN TAX POSITIONS TAKEN OR EXPECTED TO BE TAKEN THAT WOULD REQUIRE RECOGNITION OF A LIABILITY (OR ASSET) OR DISCLOSURE IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>0</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>CELLENS INC</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>700 MAIN ST NORTH</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
        </USAddress>
        <CashGrantAmt>15000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>QURCAN THERAPEUTICS</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>700 MAIN ST NORTH</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
        </USAddress>
        <CashGrantAmt>15000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>SPHERIC BIO</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>700 MAIN ST NORTH</AddressLine1Txt>
          <CityNm>CAMBRIDGE</CityNm>
          <StateAbbreviationCd>MA</StateAbbreviationCd>
          <ZIPCd>02139</ZIPCd>
        </USAddress>
        <CashGrantAmt>15000</CashGrantAmt>
        <NonCashAssistanceAmt>0</NonCashAssistanceAmt>
        <PurposeOfGrantTxt>GRANT</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>GUARDIAN BIO INC</BusinessNameLine1Txt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
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