Culture media were removed and washed with PBS for three times, and 0.1% neutral red (in PBS) was added. After 3 h, cells were washed twice with PBS, and then the image was got with an optical microscope or the quantification was obtained with lysis solution (1:1 of 0.1 M acetic acid and 100% ethanol) for 6 h, absorbance was measured at 570 nm with a Spectra (Shell) Reader.
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