title: [Gastric pepsin in duodenal ulcer].
mesh_terms: D000328:Adult; D004381:Duodenal Ulcer / Q000503:physiopathology*; D005260:Female; D005750:Gastric Juice / Q000378:metabolism; D006801:Humans; D008297:Male; D008875:Middle Aged; D010434:Pepsin A / Q000378:metabolism*
chemical_list: D010434:Pepsin A