FIG. 2.

Representative transmission electron micrographs illustrating nontransformed human duodenal epithelial SCBN monolayers incubated (for 24 h) with either 5% DMEM growth media (A) or G. lamblia sonicates (NF) (B and C). (A) Sham-treated enterocytes exhibit intact nuclear structures. (B and C) Cells coincubated with G. lamblia sonicates exhibit ultrastructural features of apoptotic cells characterized by intact organelles and cellular membranes (#), accumulation of zymogen granules (arrows), cytoplasmic vacuolation, chromatin condensation (arrowheads), and nuclear membrane delamination (∗). Bars = 1 μm.