Effects of MEKS on the activations of apoptosis-related proteins. MDA-MB-231 cells were treated with 0, 25, or 50 μg/ml of MEKS for 4 h or 30 nM paclitaxel for 24 h (positive control). Protein expressions of cleaved caspase 3 (C), 8 (B) and 9 (A), cleaved PARP (D) and <t>beta-actin</t> (the loading control) were detected by Western blotting