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125I‐LABELED RAT TRANSPLANTATION ALLOANTIBODY II. Studies on Antibody Identity and Comparative Antigen Site Numbers Per Cell

SUMMARY An exact correlation was found between the reactions of 125I-labeled and cytotoxic AS anti-August transplantation antibody when tested on the cells of a segregating backcross population (AS × (AS × Aug)). The probability that labeled antibody is detecting the products of more than one locus is <0.05, and it is concluded likely that both labeled and cytotoxic antibody are detecting only products of the Ag-B locus. Under conditions where saturation of antigenic sites had not been achieved, 37,500 molecules of 125I-labeled antibody/cell were absorbed by August lymph node lymphocytes. Therefore the antigen site number per August lymphocyte must exceed this figure. The site number on other cell types relative to August lymph node cells (LNC) is as follows: August thymocytes have 1/s the number of sites, August erythrocytes have slightly less than 1/100 the number of sites, cells from a spontaneous August myelogenous leukaemia have twice the number of sites, and (AS × Aug)F1 LNC have one-half the number of sites.