Effect of c-Myb silencing on C/EBPα-induced differentiation and proliferation inhibition in K562 cells. c-Myb (A) and CD11b and CD15 (B) levels in K562-C/EBPα-ER cells treated with 4-HT and a control or c-Myb siRNAs. (C) Cell counts of siRNA-, 4-HT–, or siRNA and 4-HT–treated K562-C/EBPα-ER cells. Mean plus SD (3 different experiments, performed in triplicate).