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K562 cells were stained with JC-1 for 15 min at 48 h post-transfection. The changes in the mitochondrial membrane potential were observed under a light microscope. PmiR-203 and arsenic trioxide (ATO) were able to independently induce apoptosis, which is presented as high-green and low-red fluorescence. 1, Control group; 2, NC group; 3, PmiR-203; 4, ATO. NC, negative control.
