. "\"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.\" [GOC:pde, GOC:vw, ISBN:0198506732]" . . "urea cycle" . "ornithine cycle" . "urea biosynthesis" . "urea biosynthetic process" . "Reactome:REACT_100599 \"Urea cycle, Oryza sativa\"" . "Reactome:REACT_107747 \"Urea cycle, Mus musculus\"" . "Reactome:REACT_109525 \"Urea cycle, Danio rerio\"" . "Reactome:REACT_31787 \"Urea cycle, Taeniopygia guttata\"" . "Reactome:REACT_32463 \"Urea cycle, Drosophila melanogaster\"" . "Reactome:REACT_32971 \"Urea cycle, Caenorhabditis elegans\"" . "Reactome:REACT_33119 \"Urea cycle, Bos taurus\"" . "Reactome:REACT_78616 \"Urea cycle, Plasmodium falciparum\"" . "Reactome:REACT_80089 \"Urea cycle, Canis familiaris\"" . "Reactome:REACT_81058 \"Urea cycle, Dictyostelium discoideum\"" . "Reactome:REACT_82995 \"Urea cycle, Mycobacterium tuberculosis\"" . "Reactome:REACT_83831 \"Urea cycle, Rattus norvegicus\"" . "Reactome:REACT_84694 \"Urea cycle, Saccharomyces cerevisiae\"" . "Reactome:REACT_847 \"Urea cycle, Homo sapiens\"" . "Reactome:REACT_88394 \"Urea cycle, Gallus gallus\"" . "Reactome:REACT_90218 \"Urea cycle, Escherichia coli\"" . "Reactome:REACT_90565 \"Urea cycle, Sus scrofa\"" . "Reactome:REACT_92378 \"Urea cycle, Xenopus tropicalis\"" . "Reactome:REACT_95880 \"Urea cycle, Staphylococcus aureus N315\"" . "Reactome:REACT_97366 \"Urea cycle, Arabidopsis thaliana\"" . "Reactome:REACT_98985 \"Urea cycle, Schizosaccharomyces pombe\"" . "Wikipedia:Urea_cycle" . . . .