1-aminocyclopropane-1-carboxylate biosynthetic process
3-cyano-L-alanine biosynthetic process
4-hydroxyproline biosynthetic process
alanine biosynthetic process +
arginine biosynthetic process via ornithine +
arginine catabolic process to ornithine
beta-alanine biosynthetic process +
citrulline biosynthetic process +
D-amino acid biosynthetic process +
D-ornithine metabolic process
discadenine biosynthetic process
gamma-aminobutyric acid biosynthetic process
glutamate catabolic process to ornithine
homocysteine biosynthetic process +
hydroxylysine biosynthetic process
isoleucine biosynthetic process +
L-alanine biosynthetic process via ornithine
L-amino acid biosynthetic process +
L-beta-ethynylserine biosynthetic process
L-dopa biosynthetic process +
L-proline betaine biosynthetic process
L-propargylglycine biosynthetic process
N-alpha,N-alpha,N-alpha-trimethyl-L-histidine biosynthetic process +
ornithine biosynthetic process
The chemical reactions and pathways resulting in the formation of ornithine, an amino acid only rarely found in proteins, but which is important in living organisms as an intermediate in the reactions of the urea cycle and in arginine biosynthesis.