Flow cytometry analysis of CD34⁺ cells selected on HCA-F84.1 complexes. Bound (A) and unbound (B) cells were double-stained with anti–CD34-PE (FL2) and anti–CD38-FITC (FL1) antibodies. The upper right region was delineated as excluding any nonspecifically labeled cell after incubation with IgG1 irrelevant controls.