title: Duodenal-ulcer inheritance.
mesh_terms: D000017:ABO Blood-Group System / Q000235:genetics; D004381:Duodenal Ulcer / Q000097:blood / Q000209:etiology / Q000235:genetics*; D006801:Humans; D010435:Pepsinogens / Q000097:blood / Q000235:genetics
chemical_list: D000017:ABO Blood-Group System; D010435:Pepsinogens