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The cytotoxic effects of polyphenolic compounds on CAL-27 cells. The cells were treated with a specified concentration [μg/mL] of respective components for 24 h and cytotoxic effects were determined by MTT assay. Cisplatin (CDDP) (10 μM) was used as a positive control. The values represent mean ± SEM of two independent experiments conducted six times (n = 12). The stars indicate that value were significantly different (∗p < 0.001) compared with control.
