Morphologic features of untreated and TRAIL-treated HL60 cells.

HL60 cultures were left untreated or were treated for 72 hours with TRAIL (0.2 μg/mL). After removing dead cells from the culture, cells were cytocentrifuged and stained with May-Grünwald-Giemsa solution (A) or were processed for transmission electron microscopy (B). In panel A, cells with monocytic morphology are indicated by asterisks. Representative fields of 5 separate experiments are shown. Original magnifications: × 400 (A), × 7000 (B).