Detection of caspase 2 and caspase 3 protein in AML peripheral blood low-density cells. A representative blot for cells from 16 of 185 patients is depicted. The lane loaded with protein of K562 cells is labeled “K562” and the lane loaded with protein from hematologically normal individuals’ peripheral blood cells is labeled “N.” The various protein levels of tubulin (55 kD) and of the uncleaved forms of caspase 2 (48 kD) and caspase 3 (32 kD) are depicted.