Effect of LMB and AD treatment on the p53, p21, Hdm2, PARP, and p73 proteins. Western blot analysis of cell extracts from cultures treated for 18 h with 20 nM LMB (1), 200 nM (2), 5 nM AD (3), 50 nM AD (4), 20 nM LMB + 5 nM AD (5), and untreated cells (6).