Noun
an amino acid that does not occur in proteins but is important in the formation of urea
Source: WordNetHowever, they require compromises in borderline cases; for example, nicotine contains a pyridine fragment from nicotinamide and pyrrolidine part from ornithine Aniszewski, p. 109 and therefore can be assigned to both classes. Source: Internet
In animals, however, the urea cycle derives putrescine from ornithine. Source: Internet
The separate pathways of converting ornithine to putrescine in plants and animals have converged. Source: Internet
The urea cycle (also known as the ornithine cycle) is a cycle of biochemical reactions occurring in many animals that produces urea (( 2 ) 2 ) from ammonia (NH 3 ). Source: Internet