Growth inhibitory effects of BMS2.4 supernatant on various hematopoietic cell lines. The indicated cell lines (1 × 10⁴ cells/well) were cultured with supernatant of BMS2 or BMS2.4 cells for 48 hours and number of remaining cells was determined by hemocytometer counts. The results are shown as the mean ± SD of triplicate cultures. Statistically significant differences from control values are indicated: *P < .05; **P < .01.