Autoradiograph from HABP cross-linking assays. Erythrocyte membrane proteins were cross-linked with radiolabeled peptides 31193 (lanes 1,2), 31202 (lanes 3,4), and 31209 (lanes 5,6). (Lanes 1,3,5) Total binding (i.e., cross-linking in the absence of unlabeled peptide). (Lanes 2,4,6) Inhibited binding (i.e., cross-linking in the presence of unlabeled peptide). (Lane 7) Total binding of scrambled peptide 33010.