Figure 4From: Role of the p53/p21 system in the response of human colon carcinoma cells to DoxorubicinPercentage of apoptotic cells in HCT116, HT29, HCT116 E6 and HCT116 p21-/- cells before and after 1 h exposure to DOX followed by 23 h incubation in drug-free medium (white bars: untreated; light grey bars: DOX 1 μM; dark grey bars: DOX 10 μM). Mean ± s.e.m. of 3 independent experiments.Back to article page