Alternate registers within OVA 323–339.

aApparent first order dissociation constants of presumed isolated registers from purified I-Ad for: single exponential fits to monophasic dissociation data (registers 1,3, ref 19), or back-calculated from reported half-life of dissociation (register 4, ref 23).bAlanine was substituted at position 325 to avoid formation of demonstrated dissociation intermediate.cLysine was substituted at position 327 to avoid alternate register binding.