Supernatant of homogenized cells was used to measure LDH activity using a LDH kit (Built Bioengineering Institute, Nanjing, China) as suggested by the manufacturer. Absorbance of the solution was measured at 450 nm using a microplate reader (Thermo Scientific, MULTISKAN MK3, Beijing, China). And three replicates were performed for each group. Protein concentrations were calculated by standard controls provided in the kit.
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