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Helicobacter pylori bacteria. Coloured scanning electron micrograph (SEM) of H. pylori bacteria (red) on the surface of a human gastric epithelial cell. H. pylori is a Gram-negative spiral-shaped bacterium found in the mucus lining of the stomach. It causes gastritis, and is also the most common cause of stomach ulcers. It may also be a cause or co-factor for gastric cancer as its presence increases the risk of developing stomach tumours.
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