A glass cover slip was preplaced in a 6-well plate to make cell slide. The cells were fixed with 95% ethanol at room temperature for 15 min. 100 mg/L of AO (Sigma, St.Louis, MO) dissolved in PBS and 100 mg/L of EB (Sigma, St.Louis, MO) dissolved in PBS were mixed, each with 5 μL, and then immediately added to the cells. After 30 s, it was observed using a confocal laser microscope (LSCM880NLO, Zeiss, Germany).
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