Term Name:	urea cycle
Synonyms:	ornithine cycle, urea biosynthesis, urea biosynthetic process
Definition:	The sequence of reactions by which arginine is synthesized from ornithine, then cleaved to yield urea and regenerate ornithine. The overall reaction equation is NH3 + CO2 + aspartate + 3 ATP + 2 H2O = urea + fumarate + 2 ADP + 2 phosphate + AMP + diphosphate.
Ontology:	GO: Biological Process [GO:0000050]    QuickGO    AmiGO