Ulceration of the gastric mucosa with Helicobacter pylori, and treatments. Zoom on the gastric mucosa seen in section. On the left, an ulcer in the presence of Helicobacter pylori bacteria responsible for the destruction of the superficial mucous cells. Right gastric mucosa healthy with gastric glands: the crypt secreting mucus, the body of the gland secreting gastric juices with the mucous cells of the neck (dark pink), the parietal cells with the proton pump (light pink) and the main cells (purple). An overview of Helicobacter pylori bacteria in section details the wall structure with PLP, bacterial DNA, messenger RNA and ribosomes, sites of action of antibiotics.