Separation of human lymphocytes of HLA-B7 positive blood donor (red-filled) from human lymphocytes of HLA-B7 negative blood donor (black-dashed) in flow cytometry surface staining of human peripheral whole blood samples, labeling HLA B7 with Anti-HLA B7 Antibody [BB7.1] (A86658), (concentration in sample 2 µg/ml, GAM APC).