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The effect of coumarins on expression of apoptotic-related genes on (a) SKNMC, (b) PC3, and (c) H1299 human cancer cells. Normalization relative to b-actin was performed. Levels of mRNA are expressed relative to control in the mean ± S.E.M values derived from three independent experiments. *P < 0.05, **P < 0.01, and ***P < 0.001 versus control.
