The urea cycle, also known as the ornithine cycle, is a cycle of biochemical reactions occurring in many animal organisms that produces urea from ammonia (NH4+). This cycle was the first metabolic cycle discovered (Krebs and Hensenleit, 1932).

National Urea Cycle Disorders Foundation - Information about the organization as well as the disease. Family support, membership, newborn screening project and medical information.
Meta Description: [ The National Urea Cycle Disorders Foundation is a non-profit organization dedicated to the identification, treatment and cure of urea cycle disorders. ]
Urea Cycle Disorders - Information, medical links and a message board. The true story of a one family's struggle with this illness.
Meta Description: [ A site dedicated to raising awareness of Urea Cycle Disorders-a fatal, frequently overlooked disorder. Contains info on UCD's, and ordering info for the true story of a family's struggle to diagnose their son. ]
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