title: Active site in zymogens. Proton magnetic resonance pH titration curves of histidine-57 in porcine and bovine trypsinogens and in their complexes with bovine pancreatic trypsin inhibitor (Kunitz).
mesh_terms: D000818:Animals; D002417:Cattle; D006639:Histidine; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009682:Magnetic Resonance Spectroscopy; D010179:Pancreas / Q000201:enzymology*; D013552:Swine; D014359:Trypsin Inhibitor, Kazal Pancreatic; D014361:Trypsin Inhibitors; D014362:Trypsinogen / Q000378:metabolism*
chemical_list: D014361:Trypsin Inhibitors; D006639:Histidine; D014359:Trypsin Inhibitor, Kazal Pancreatic; D014362:Trypsinogen