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U937 (A) or HL-60 (B) were treated for 24 h with diluent or the indicated concentration of SCH 900776 in the absence or presence of the indicated concentration of cytarabine, washed and plated in 0.3% agar. After 10–12 days, colonies containing >50 cells were counted at low magnification. Error bars, ± SD of quadruplicate aliquots. Similar results were obtained in three independent experiments.
