Cells grown in logarithmic phase were inoculated in 96-well plates at a density of 1 × 104 cells/well for conventional culture. After 24 hours, 10 μl CCK-8 solution was added to each well. Cells were placed in the dark for 1 hour, then absorbance at a 450-nm wavelength was detected by a microplate reader (Bio-Rad, Hercules, CA, USA).
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