We measured apoptotic cells by propidium iodide staining and FACS analysis [15]. Cells were harvested; pelleted by centrifugation; resuspended in phosphate-buffered saline (PBS) containing 50 μg/mL propidium iodide, 0.1% Triton X-100, and 0.1% sodium citrate; and subjected to vortexing prior to FACS analysis (Becton-Dickenson FACScan, Mountain View, CA; FL-3 channel).
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