Epitope mapping of MAb-1G10. (A) Results of phage display screening against MAb-1G10 using a 7-mer (C7C; conformatially constrained by inclusion of flanking cysteines) and a linear (no conformational constraints) 12-mer library. Phage vector sequences are indicated by bold type. (B) Chemically synthesized epitope peptides containing Cluster I and Cluster II consensus sequences. Conserved residues are underlined.