title: Mucous change in the duodenum.
mesh_terms: D001706:Biopsy; D004381:Duodenal Ulcer / Q000473:pathology*; D004386:Duodenum / Q000032:analysis; D005750:Gastric Juice / Q000378:metabolism; D006801:Humans; D007413:Intestinal Mucosa / Q000473:pathology*; D008854:Microscopy, Electron; D009093:Mucus / Q000166:cytology; D013274:Stomach Neoplasms / Q000473:pathology*; D013276:Stomach Ulcer / Q000473:pathology*