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Blue LED irradiations combined with ATO accelerate OS cell apoptosis. U-2 OS cell apoptosis was detected 24 hrs the treatment of blue LED and/or ATO by TUNEL staining. (A) Representative images of TUNEL staining were shown in blue (DAPI) and green (TUNEL). (B) The histogram shows the percentages of the apoptotic cells (TUNEL positive). Bar: 100 μm. Data are expressed as the mean ± SEM. N=4. ***P < 0.001.
