Fig. 4 Inhibited recognition of induced cells by anti-HLA-A2 antibody. Target cells were incubated with 100 μl anti-HLA-A2 antibody (functionally blocking mAb, from BB7.2 cell hybridoma supernate) for 1 h at 4 °C. The cytotoxic activities of CTLs were determined against target cells at various E/T ratios using 51Cr release assay. Experiments performed in triplicate showed consistent results. Compared with controls, P < 0.05