definiens: means, with respect to a Research Program, the time periodbeginning upon the Final Delivery with respect to such Research Program and ending on the earlier of ( a)exercise of the Option with repect to such Research Program, ( b ) the commencement of IND - enablingtoxicology studies with final lead from master cell bank with respect to a Product containing Program - BenefitedAntibodies from such Research Program, ( c ) the non - confidential disclosure of the sequence of any Program - Benefited Antibody from such Research Program ( including via Patent prosecution ), ( d ) the entering into of aLicensee Agreement with respect to Program - Benefited Antibodies from such Research Program, or ( e ) [ * * * ] after such Final Delivery under such Research Program ; provided, however, that [COMPANY], at its sole option, may extend such [ * * * ] deadline in clause ( e ) by one or more periods of [ * * * ] by making one - time, non - creditablepayment(s ) of [ * * * ] with respect to each such [ * * * ] extension, such amount to be paid at least [ * * * ] prior to theend of the then applicable Evaluation Term