HLA-B7 on human red blood cells. Improved detection by a radioactive anti-IgG test

By means of a sensitive radioimmune anti-IgG test (RIAT) HLA-B7 was demonstrated on RBC of all B7 positive individuals (N = 52). Most antigens of the B7 cross-reacting group (B8, 13, w22, 27, 40; N = 36) were also detected. Eluates from B7 positive RBC exhibited clear B7 specificity against RBC as well as lymphocytes.