definiens: shall mean the period starting when a particular Collaboration Target is accepted into the Collaboration, and shall continue for the longer of : ( a ) the duration of the Collaboration Term, ( b ) two ( 2 ) years following the JRC 's decision to discontinue work on the applicable Collaboration Target under the applicable Research Plan, ( c ) in the event that the other Party is undertaking development and commercialization of a Collaboration Compound against the applicable Collaboration Target pursuant to the terms of this Agreement, a period of three ( 3 ) years from the cessation of work on the applicable Collaboration Target under the applicable Research Plan or ( d ) for so long as the other Party is undertaking diligent development aI)d commercialization of a Collaboration Product against the applicable Collaboration Target pursuant to Section 7.2 . ( or has remedied any failure of diligence in accordance with the provisions of Section 7.4 ) ; provided that upon First Commercial Sale of such a Collaboration Product, the Exclusivity Period shall be extended until five ( 5 ) years from First Commercial Sale of such Collaboration Produ