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“The ratio of ornithine to citrulline , a marker of urea cycle function, was elevated at all postoperative time points compared with preoperative values, indicating decreased urea cycle function.”
“The results indicated that the membrane transport system of citrulline in the human kidney was clearly inhibited by dibasic amino acids, lysine, ornithine , and arginine.”
The Journal of biological chemistry • 1981 | 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.”