Electron micrographs of J774A.1 macrophages infected with wild-type S. typhimurium.
A and B: Macrophage 3 hrs. after infection with wild-type S. typhimurium showing morphological features of apoptosis, such as membrane blebbing, fragmentation, and condensation of the chromatin (A), and the presence of apoptotic bodies (B).
C: Macrophage with necrotic morphology.
D: Uninfected macrophage.