definiens: means, with respect to each Feasibility Study Target, the period beginning on theacceptance by [COMPANY] of such Feasibility Study Target pursuant to Section 2.3.4 and ending ( a ) with respect to any suchFeasibility Study Target with regard to which no Active Aptamer is identified, a period of [ * * * ] following the initiation ofArchemix Feasibility Study Activities with respect to such Feasibility Study Target ; and ( b ) with respect to any FeasibilityStudy Target with regard to which an Active Aptamer is identified, a period of [ * * * ] following the delivery by [COMPANY] toLilly of quantities of such Active Aptamer pursuant to Section 2.4.5 ; provided, that, if this Agreement is terminated prior tothe end of the Feasibility Study Term, the effective date of such early termination shall become the last day of the FeasibilityStudy Term