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Pristimerin disturbs cell cycle distribution in CAL-27 and SCC-25 cells. (A) CAL-27 and SCC-25 cells were treated with the indicated concentrations of pristimerin for 24 h or with 1 µM for 12 h, and were stained with PI. Subsequent cell cycle distributions were assessed by flow cytometry. (B) Statistical analysis of cell cycle distributions in CAL-27 and SCC-25 cells (=3). PI, propidium iodide. *P<0.05; **P<0.01 and ***P<0.001 vs. control.
