The CCK-8 reagent was purchased from APExBIO (USA). The 2×103 cells were seeded into 96-well plates in advance. The test was started 24 hours later and lasted for 6 consecutive days (0, 1, 2, 3, 4, 5, 6 days). The medium was absorbed and discarded, and CCK-8 reagent was mixed with serum-free medium in a 5ml eppendorf tube (CCK8 reagent: Serum-free medium =10 μL: 90 μL per well) and added into 96-well plates with 100 μL per well. OD value at 450 wavelength was detected on a microplate after incubation at 37°C for 1h.
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