Fig. 4.
Effect of ATRA on the expression of p21WAF1, p27KIP1, CDK2, and CDK4 in OPM-2 and C5 cells. Nuclear extracts from control cells and cells treated with 10−6mol/L ATRA for 24 hours were analyzed by Western blot. The blots were sequentially stripped and probed with antibodies to p21, p27, CDK2, and CDK4.