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The level of protein expression in the MCF-7 cells. The β-actin was used as the loading control. The protein levels of Bax and Bcl-2 in the control and treated cells were quantified by ImageJ software and normalized to β-actin band intensity. Values are expressed as mean ± SD. * p < 0.05, ** p < 0.01, † p < 0.05; * and † symbols respectively indicate the comparison to control and QT-treated cells.
