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Inhibitory effect of NAC on cis-3-O-p-hydroxycinnamoyl ursolic acid (HCUA)-induced apoptosis. Ca9-22 cells were treated with NAC, HCUA, or a combination of both, harvested 48 h post-treatment, stained with propidium iodide, and then examined by flow cytometry (A). The percentage of cells in the sub-G1 (apoptotic) phase is shown in (B). *p<0.05.
