definiens: means a molecule which comprises or contains : ( a ) one or more immunoglobulin variabledomains ; ( b ) fragments, variants, modifications or derivatives of such immunoglobulin variable domainsirrespective of origin or source, including but not limited to antigen binding portions including Fab, Fab ’, F(ab’)2,Fv, dAb and CDR fragments, single chain antibodies ( scFv ), chimeric antibodies, monospecific antibodies, diabodies and polypeptides ( including humanized versions thereof ) that contain at least a portion of animmunoglobulin that is sufficient to confer specific antigen binding to the polypeptide ; or ( c ) the nucleic acidconsisting of a sequence of nucleotides encoding ( or complementary to a nucleic acid encoding ) the foregoingmolecules in ( a ) or ( b ) . For clarity, as used in this Agreement, the term shall not include Probodies orPDCs