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Western blots of ERK1/2 protein expression in OVCAR-3 and A-549 cells incubated with CMB and doxorubicin at IC50 values for 24 h or 48 h. Means and SE were calculated from three independent experiments. Statistically significant results relative to untreated control were presented as: * p < 0.05; ** p < 0.01; *** p < 0.001.
