1. Then, the enzymes citrulline and argininosuccinate convert ornithine to arginine. 2. It inhibits ornithine aminotransferase at concentrations as low as 10 nM. 3. Citrulline is made from ornithine and carbamoyl phosphate by ornithine carbamoyltransferase. 4. Citrulline is made from ornithine and carbamoyl phosphate by ornithine carbamoyltransferase. 5. Ornithine then undergoes a pyridoxal phosphate-dependent decarboxylation to form putrescine.6. In animals, however, the urea cycle derives putrescine from ornithine . 7. This enzyme participates in d-arginine and d-ornithine metabolism. 8. It is the salt formed from ornithine and alpha-ketoglutaric acid. 9. Arginase catalyzes the hydrolysis of arginine to ornithine and urea. 10. The active form of ornithine decarboyxlase is a homodimer.
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