Effect of BAH-1 MoAb on murine CFU-MK colonies. CFU-MK megakaryocytes were scored as the number of colonies with three cells or more per 10⁵ unfractionated cells. BAH-1 (1 μg/mL) was used in various dilutions as indicated. Results are the means ± SEM from triplicate cultures from three experiments. *Results were significantly different (P < .01) from FCS control.