definiens: means ( a ) with respect to a given EditasBackground Patent ( other than any such Patent Rights Controlled by Editas under theHarvard - Broad Licenses ) or Editas Collaboration Patent, a challenge to the validity, patentability or enforceability of such Editas Background Patent or EditasCollaboration Patent, in a legal action or an administrative proceeding initiated by oron behalf of Juno or its Affiliate, but excluding any such challenge in defense of anyclaims raised by or on behalf of Editas ( or any of its Affiliates, sublicensees or In - Licensors ) against Juno ( or any of its Affiliates ), or otherwise in connection with anassertion of a cross - claim or a counter - claim ; and ( b ) with respect to any PatentRights Controlled by Editas under the Harvard - Broad Licenses, the patent challengeterms of Section 5.6 applicable to such Harvard - Broad License shall apply