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Amino acid sequences of variable (V) regions of monoclonal Ab3 antibodies (mAb3) 1A4 and 3B11 aligned with those of DB3. (a) Heavy chain variable region (VH) (b) Light chain variable region (VL). Asterisks denote residues that make contact with ligand in the DB3-progesterone-11α–hemisuccinyl (HMS) complex.24
