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        <ManagementAndGeneralAmt>34756</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>116323</ProgramServicesAmt>
        <ManagementAndGeneralAmt>221525</ManagementAndGeneralAmt>
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      <InformationTechnologyGrp>
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        <ProgramServicesAmt>111979</ProgramServicesAmt>
        <ManagementAndGeneralAmt>111979</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>47643</ProgramServicesAmt>
        <ManagementAndGeneralAmt>47643</ManagementAndGeneralAmt>
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      <ConferencesMeetingsGrp>
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        <ProgramServicesAmt>2984</ProgramServicesAmt>
        <ManagementAndGeneralAmt>2984</ManagementAndGeneralAmt>
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        <ProgramServicesAmt>347266</ProgramServicesAmt>
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      <InsuranceGrp>
        <TotalAmt>97878</TotalAmt>
        <ManagementAndGeneralAmt>97878</ManagementAndGeneralAmt>
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        <Desc>LAB EXPENSES</Desc>
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        <ProgramServicesAmt>3225224</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>PRODUCT SHIPPING FEES</Desc>
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        <ProgramServicesAmt>2439254</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>ORDER MERCHANT CARD FEE</Desc>
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        <ProgramServicesAmt>210153</ProgramServicesAmt>
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      <OtherExpensesGrp>
        <Desc>BAD DEBT EXP</Desc>
        <TotalAmt>98288</TotalAmt>
        <ManagementAndGeneralAmt>98288</ManagementAndGeneralAmt>
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      <AllOtherExpensesGrp>
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      <TotalFunctionalExpensesGrp>
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        <EOYAmt>6862133</EOYAmt>
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        <EOYAmt>1922484</EOYAmt>
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        <EOYAmt>208519</EOYAmt>
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        <EOYAmt>1872389</EOYAmt>
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      <InfoInScheduleOPartXIInd>X</InfoInScheduleOPartXIInd>
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          <BusinessNameLine1Txt>DANA-FARBER CANCER INSTITUTE</BusinessNameLine1Txt>
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        <CityNm>BOSTON</CityNm>
        <StateAbbreviationCd>MA</StateAbbreviationCd>
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          <BusinessNameLine1>RESTRICTED</BusinessNameLine1>
        </ContributorBusinessName>
        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
          <City>RESTRICTED</City>
          <State>RESTRICTED</State>
          <ZIPCode>RESTRICTED</ZIPCode>
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        <BookValueAmt>702179</BookValueAmt>
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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPANY IS EXEMPT FROM FEDERAL INCOME TAXES UNDER INTERNAL REVENUE CODE SECTION 501(C)(3) AND THEREFORE HAS MADE NO PROVISION FOR FEDERAL OR STATE INCOME TAXES. THE COMPANY FOLLOWS ACCOUNTING GUIDANCE REGARDING THE 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. TAX POSITIONS NOT DEEMED TO MEET A MORE-LIKELY-THAN-NOT THRESHOLD WOULD BE DISCLOSED IN THE FINANCIAL STATEMENTS. THERE WERE NO UNCERTAIN TAX POSITIONS THAT REQUIRE DISCLOSURE IN THE FINANCIAL STATEMENTS AS OF DECEMBER 31, 2019 AND 2018. THE COMPANY RECORDS INTEREST AND PENALTIES, IF ANY, AS PART OF INCOME TAX EXPENSE. NO INTEREST OR PENALTIES WERE RECORDED IN 2019 OR 2018. THE COMPANY'S INCOME TAX RETURNS ARE SUBJECT TO REVIEW AND EXAMINATION BY FEDERAL AND STATE TAXING AUTHORITIES. THE COMPANY IS CURRENTLY OPEN TO AUDIT UNDER THE APPLICABLE STATUTES OF LIMITATIONS BY THE INTERNAL REVENUE SERVICE AND STATE TAXING AUTHORITIES FOR THE YEARS ENDED AFTER DECEMBER 31, 2015.</ExplanationTxt>
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      <SupplementalInformationDetail>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III ACCOUNTING METHOD:</FormAndLineReferenceDesc>
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        <NontaxableBenefitsFilingOrgAmt>19913</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>232523</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MELINA FAN</PersonNm>
        <TitleTxt>DIR/CHIEF SCIENTIFIC OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>194722</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7280</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>120</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>5910</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>16881</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>224913</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MICHAEL LOHNES</PersonNm>
        <TitleTxt>SENIOR DIRECTOR OF FINANCE</TitleTxt>
        <BaseCompensationFilingOrgAmt>138773</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7280</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>115</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>837</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>13898</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>160903</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DANIELA BOURGES-WALDEGG</PersonNm>
        <TitleTxt>CHIEF TECHNOLOGY OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>159788</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7280</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>180</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18210</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>185458</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ANDREW BALTUS</PersonNm>
        <TitleTxt>CHIEF OPERATING OFFICER</TitleTxt>
        <BaseCompensationFilingOrgAmt>155988</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7280</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>120</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>4680</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>14156</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>182224</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>LIANNA SWANSON</PersonNm>
        <TitleTxt>SENIOR DIRECTOR OF BIOLOGY</TitleTxt>
        <BaseCompensationFilingOrgAmt>117450</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>7280</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>82</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>3755</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>21732</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>150299</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>MEGHAN REGO</PersonNm>
        <TitleTxt>ASSOCIATE DIRECTOR OF VIRAL VECTORS</TitleTxt>
        <BaseCompensationFilingOrgAmt>129738</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>1000</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>103</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>837</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>18744</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>150422</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>COMPENSATION COMMITTEE</FormAndLineReferenceDesc>
        <ExplanationTxt>THE INDEPENDENT BOARD MEMBERS ACT AS THE COMPENSATION COMMITTEE AND HAVE IN PLACE A FORMAL WRITTEN PROCESS TO EVALUATE AND SET THE COMPENSATION OF THE CEO AND OTHER OFFICERS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>CHU RING &amp; HAZEL</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>JOHN CHU, PTR OF LAW FIRM</RelationshipDescriptionTxt>
        <TransactionAmt>7982</TransactionAmt>
        <TransactionDesc>LEGAL FEES</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>HAMILTON BROOK SMITH &amp; REYNOLDS</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>DAVID BROOK, PARTNER</RelationshipDescriptionTxt>
        <TransactionAmt>331</TransactionAmt>
        <TransactionDesc>LEGAL FEES</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2</FormAndLineReferenceDesc>
        <ExplanationTxt>MELINA FAN AND KENNETH FAN ARE SIBLINGS. MELINA FAN AND BENJIE CHEN ARE SPOUSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 WAS REVIEWED BY MANAGEMENT ALONG WITH THE AUDITED FINANCIAL STATEMENTS. A FULL COPY OF FORM 990 IS PROVIDED TO ALL BOARD MEMBERS FOR REVIEW PRIOR FILING TO THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC. HAS A CONFLICT OF INTEREST POLICY IN PLACE. ALL OFFICERS, DIRECTORS AND KEY EMPLOYEES ARE REQUIRED TO DISCLOSE ANNUALLY ANY INTERESTS THAT COULD GIVE RISE TO CONFLICTS. INQUIRES ARE MADE DURING BOARD OF DIRECTOR MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC.'S INDEPENDENT BOARD MEMBERS REVIEWED AND DETERMINED THE COMPENSATION OF ALL OFFICERS ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC.'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>FOREIGN CURRENCY LOSSES -4,631.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII CINE 2C</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE WAS NO CHANGE IN THE OVERSIGHT PROCEES OR SELECTION PROCESS DURING THE TAX YEAR 2019.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>