Effects of UO126 and SB203580 on hemin-induced erythroid differentiation of K562s cells.

Cells were induced with butyrate (A) or hemin (B) in the absence or presence of 10 μM UO126 (UO) and 10 μM SB203580 (SB), respectively. Shown are relative changes of hemoglobin expression compared to the inducing agent without inhibitor. Each experiment was performed 4 times and standard errors were calculated as indicated.