definiens: means, with respect to each Co - Developed Collaboration Aptamer, [ * * * ] days from ( a ) the [ * * * ] bythe [ * * * ] to [ * * * ] an [ * * * ] for [ * * * ] ( the ), ( b ) the [ * * * ] by ARCHEMIX of the [ * * * ] and any other[***]by MERCK to [ * * * ] the [ * * * ] by the [ * * * ] into the [ * * * ] or [ * * * ] ( the ), and/or ( c ) the [ * * * ] byARCHEMIX of the [ * * * ] and any other [ * * * ] by MERCK to [ * * * ] the [ * * * ] by the [ * * * ] to [ * * * ] the [ * * * ] with respect tosuch [ * * * ] ( the )