Flow cytometric analysis of HLA-A2 and MUC1 expression on the human tumor cell lines. The level of HLA-A2 expression (dotted line) was analyzed using a purified MoAb specific for HLA-A2, BB7.2. The MUC1 expression was determined using unlabeled antibodies HMFG-1 (bold solid line) and MAM-6 (thin solid line), followed by staining with FITC-conjugated goat antimouse antibody. Solid histograms represent isotype-matched controls.