Figure 3.

Autoradiograph of the SDS/PAGE analysis of the cross-linking products formed between c56t and c16t and their targets on the RBC membranes in the presence or absence of competitor ligand. The radioactive ligand present in each group of three lanes and the presence (+) or absence (−) of a thousandfold excess of nonradioactively labeled ligand is indicated above. The specific cross-linking products for each ligand is denoted by an arrow.