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“Carbamyl phosphate synthetase was also protected by IMP and ornithine , positive allosteric effectors that alter the enzymatic activity be increasing the affinity for ATP.”
Proceedings of the National Academy of Sciences of the United States of America • 1975 | View Paper
“Addition of ammonia alone produced only a small increase of urea formation, which was stimulated 2-fold by ornithine in conjunction with a fall of ATP levels and an accumulation of citrulline.”