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Effect of QTL on apoptosis and apoptosis-related proteins. SW620 cells were exposed to QTL (50, 100 and 200 µg/ml for 48 h, and collected for analysis of apoptosis using (A) flow cytometry and (B-G) western blotting. Each bar represents the mean ± SD referred to the corresponding β-actin values (n=3); *P<0.05 and **P<0.01 compared to the control. QTL, quercetrin from T. sinensis leaves.
