Distinct patterns of mucosal apoptosis in H pylori-associated gastric ulcer are associated with altered FasL and perforin cytotoxic pathways

Figure 1 Terminal deoxynucleotidyltransferase (TdT)-mediated dUDP-biotin nick end labelling (TUNEL)-positive apoptotic cells. Photomicrographs show tissues obtained from the antral mucosa of: a non-infected control patient (A), a patient with H pylori-associated gastritis (B), a patient with active gastric ulcer (C), at the ulcer margin of the same patient (D), and after eradication therapy (E), and a negative control, without TdT enzyme (F), respectively. Arrowheads show positive cells in the epithelium and in the lamina propria (Original magnification × 400).