Fisetin was purchased from Sigma-Aldrich Corporation (St. Louis, MO, USA) and was dissolved in dimethyl sulfoxide (DMSO) (Sigma-Aldrich) to obtain a 10 mM stock solution. The stock solution was ultimately diluted in culture medium to obtain the desired concentration. The control group was treated with DMSO at a final concentration of 0.1% to eliminate the effect of the reagent.
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