Percentage of purified bone marrow progenitor cells undergoing apoptotic cell death.

From healthy volunteers and patients with myelokathexis, as determined by FACS analysis of annexin-V–fluorescein isothiocyanate–propidium iodide–labeled cells. (open bars) Freshly isolated cells. (filled bars) Same cell populations stored overnight in 10% autologous serum. Data for control subpopulations represent mean value of 4 healthy volunteers ± SD.