c-Myb and GATA-2 expression in 4-HT–treated C/EBPα-ER–transduced normal and CML-BC CD34⁺ cells. Western blots show c-Myb and GATA-2 levels and in normal CD34⁺ cells (A) and in CML-BC CD34-enriched (80%) cells (B). Expression of C/EBPα-ER and GRB2 was also assessed as control. Data are representative of 2 experiments. CD34⁺ normal cells were from 2 donors.