title: Proposed mechanism for urea nitrogen re-utilization: relationship between urea and proposed guanidine cycles.
mesh_terms: D000818:Animals; D006146:Guanidines / Q000378:metabolism*; D006801:Humans; D006900:Hydroxylation; D020162:Hyperargininemia; D008862:Microsomes, Liver / Q000378:metabolism; D008954:Models, Biological; D009584:Nitrogen / Q000378:metabolism*; D051381:Rats; D014508:Urea / Q000378:metabolism*
chemical_list: D006146:Guanidines; D014508:Urea; D009584:Nitrogen