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Effects of sodium formate on the apoptosis of 661W cells, as determined by an annexin V-FITC assay using flow cytometric analysis. The 661W cells were exposed to (A) 0 (control), (B) 15 or (C) 30 mM sodium formate for 24 h. The cultures were stained with annexin V-FITC and PI. FITC, fluorescein isothocyanate; PI, propidium iodide; Quad, quadrant; UL, upper left; UR, upper right; LL, lower left; LR, lower right.
