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Hsian‐tsao extract (HTE) decreases the cell viability (a) Cells were treated with the indicated concentrations of hsian‐tsao for 24 hr; the control cells were not treated. (b). N‐acetyl‐cysteine (NAC) (3 mM) reversed hsian‐tsao‐induced cell death. The experiments were independently repeated three times (n = 3). C: means control group. *p < 0.05, **p < 0.01
