definiens: means : ( a ) with respect to a given Collaboration Druggable /LDD Target, the period beginning on the Effective Date and ending on the later of ( i ) [ * * * ] after the Effective Date or ( ii ) [ * * * ] after the date on which [COMPANY] exercised the app licable Option ; ( b ) with respect to a given Reverted Non - Optioned T arget, the period beginning on the Effective Date and ending [ * * * ] after the Effective Date ; ( c ) with respect to a given Reverted Optioned Target, t he period beginning on the Effective Date and ending on the later of ( i ) [ * * * ] after the Effective Date or ( ii ) [ * * * ] after the date on which [COMPANY] exercised the applicable Option ; and ( d ) with respect to a given Unblinded Undruggable T arget, the period beginning on the Effective Date and ending on the later of ( i ) [ * * * ] after the Effective Date or ( ii ) [ * * * ] after the date ( if any ) on which [COMPANY] exercised the applicable Option