The effect on mRNA levels of the TfR, mdm-2, WAF1, GADD45, and β-actin after exposure of SK-N-MC and BE-2 cells to DFO (150 μmol/L) or 311 (25 μmol/L) for 20 hours, and also cells exposed to these agents for 20 hours followed by reincubation for 20 hours in medium containing FAC (100 μg/mL). (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.