title: Letters to the editor: Red-cell acetylcholinesterase activity in duodenal ulcer.
mesh_terms: D000110:Acetylcholinesterase / Q000097:blood*; D000328:Adult; D004381:Duodenal Ulcer / Q000201:enzymology* / Q000235:genetics; D004912:Erythrocytes / Q000201:enzymology*; D006801:Humans; D008297:Male; D008875:Middle Aged
chemical_list: D000110:Acetylcholinesterase