Representative cell cycle distribution by flow cytometry.

<p>Huh7 and Hep3B cells were treated with PP (0, 50 or 100 µg/ml) for 48 hr, harvested and subjected to flow cytometry analysis of their DNA content. Data are means±SD of three independent experiments. Significant differences between the PP-treated and untreated cells were statistically analyzed by ANOVA (Tukey's multiple comparison test; *, <i>P</i><0.05; **, <i>P</i><0.005).