title: Hans Krebs and the discovery of the ornithine cycle.
mesh_terms: D001119:Arginase / Q000502:physiology; D001671:Biochemistry / Q000266:history*; D002952:Citric Acid Cycle; D004739:England; D005858:Germany; D049673:History, 20th Century; D009952:Ornithine / Q000502:physiology; D014508:Urea / Q000378:metabolism
chemical_list: D014508:Urea; D009952:Ornithine; D001119:Arginase