title: Letter: A reply to the question of pH.
mesh_terms: D000863:Antacids / Q000627:therapeutic use*; D006471:Gastrointestinal Hemorrhage / Q000188:drug therapy* / Q000201:enzymology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D010434:Pepsin A / Q000378:metabolism; D013312:Stress, Physiological
chemical_list: D000863:Antacids; D010434:Pepsin A