title: Microenvironment of histidine 12 in ribonuclease-S as detected by 13C nuclear magnetic resonance.
mesh_terms: D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D006639:Histidine; D009682:Magnetic Resonance Spectroscopy; D012260:Ribonucleases
chemical_list: D002247:Carbon Isotopes; D006639:Histidine; D012260:Ribonucleases