definiens: means a bona fide internal research, development orcommercialization program undertaken by [COMPANY] with respect to a Target, with respect to which, as of the dateof [ * * * ] from the [ * * * ] of a [ * * * ] for such Target ( the ), an Antibody Targeting such Target, whether ornot conjugated to a cytotoxic or cytostatic agent ( which may or may not be a Cytotoxic Compound ) has beengenerated by or on behalf of [COMPANY] ( an ), and [COMPANY] owns orhas otherwise acquired rights to use such [COMPANY] Internal Product Candidate in the research or development of [ * * * ] or [ * * * ] for use in the Field and further provided that ( a ) as of the Receipt Date, [COMPANY] or an Affiliate ofImmunoGen had commenced process development activities in connection with a [ * * * ] of such [COMPANY] InternalProduct Candidate or ( b ) as of the Receipt Date, [COMPANY] is conducting research and preclinical studies [ * * * ] or [ * * * ] in any [ * * * ] of such [COMPANY] Internal Program Candidate in a sustained manner consistent with ImmunoGen’sother internal programs at similar stages of research and development