Proliferative responses of MCs obtained from patient C1 with cold hemagglutinin disease (A), patient C4 with systemic lupus erythematosus (B), and patient C9 with chronic renal failure (C) against the panel of 42 peptides corresponding to the Rh D protein. In each case, all the peptides were tested on a single occasion, and the dashed line indicates the level of proliferation taken as representing a positive response (the higher of SI = 3 or CPM = 500).