Detection of apoptotic cells was done with fluorescein isothiocyanate- or allophycocyanin-labeled annexin V (BD Biosciences, Franklin Lakes, NJ, USA) and PI (Hoffman-La Roche, Basel, Switzerland), as described [53 (link)]. Apoptotic cells were analyzed on a BD FACSCalibur flow cytometer (BD Biosciences). Early apoptotic cells were stained with annexin V but not PI, whereas late apoptotic or necrotic cells were stained with both annexin V and PI.
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