Cells from each treatment group were harvested after 24 h and caspase activity was detected by a Caspase-Glo 3/7 assay kit (Promega, Taipei, Taiwan). Briefly, 100 μL of Caspase-Glo 3/7 reagent was added to each well of the plates, followed by mixing for 1 min. Subsequently, these plates were incubated at room temperature for 2 h. Absorbance values were measured with a microplate reader at 405 nm (Synergy HTX Multi-Mode Reader; Biotek, Taipei, Taiwan).
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