The effect of the concentration of HU on mRNA levels of the TfR, mdm-2, WAF1, GADD45, and β-actin in BE-2 neuroblastoma cells. (A) Ethidium bromide staining of the agarose gel; (B) TfR; (C) mdm-2; (D) WAF1; (E) GADD45; (F) β-actin. The result shown is a typical experiment from two experiments performed.