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Effect of cis-3-O-p-hydroxycinnamoyl ursolic acid (HCUA) on cell cycle profile of oral cancer cell lines (Ca9-22 and SAS) and normal oral fibroblasts (OF). Cells were harvested 48 h post-treatment, stained with propidium iodide, and then analyzed by flow cytometry (A). The percent of Ca9-22, SAS, and OF cells in the sub G1 (apoptotic) phase after treatment with HCUA was determined (B). **p<0.01, ***p<0.001 compared with mock cells.
