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the H type I structure, synthesized by the secretor (Se) enzyme in gastric foveolar cells, and its metabolite, Lewis b (le(b)) antigen, mediate the adhesion of Helicobacter pylori ( H. Pylori) to the gastric epithelium, whereas H. Pylori does not bind to modified forms of Le(b) specific for blood types A and B. Such host factors as Le and Se genotypes and ABO blood type may affect the establishment of H. Pylori infection and, once infected, the risk of chronic atrophic gastritis.

ABO blood type, Lewis and Secretor genotypes, and chronic atrophic gastritis: a cross-sectional study in Japan