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GNAS and KRAS mutations in gastric foveolar metaplasia and gastric heterotopia. (A) Representative GNAS and KRAS mutations identified in gastric foveolar metaplasia, gastric heterotopia, and adenocarcinoma of the duodenum. (B) GNAS mutations in each epithelial component of gastric heterotopia. An identical missense mutation is present in both the foveolar epithelium and oxyntic glands. Missense mutations are indicated by arrowheads. GNAS was sequenced using reverse primers.
