After hypoxia induction and treatment, the cells were washed twice with 200 μL of PBS. Cells were incubated for 15 minutes with a solution of 5 mL of DAPI dye (Solarbio, Beijing, China) in 500 mL PBS. Cells were incubated for 15 min in the dark, washed twice with PBS, and then observed using light microscopy (U-RFLT50, Olympus, Japan).
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