After cell treatment, the culture medium was discarded, and the adherent cells were treated for 4 h with 0.5 mg/mL MTT. Then, the MTT was removed, and formazan crystals were dissolved with 100 µL DMSO, including the control group, and quantified by measuring the absorbance at 570 nm in a microplate reader Bio-Rad Xmark spectrophotometer (Bio-Rad Laboratories, Hercules, CA, USA) [28 (link)]. Cell viability was expressed as a percentage of the control. Six experiments were performed in triplicate.
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