Flow cytometry analysis of apoptosis.

Cultured cells were labeled every 3 days with a mixture of annexin V and PI and analyzed by flow cytometry. Apoptotic (annexin V+/PI−) cells from 7 normal (■), 6 RARS (░), and 12 RA/RAEB (▪) cultures were quantified and results expressed as mean percentages ± SD. The asterisk indicates P < .05.