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Plasma citrulline amino (2-), δ (5-), and ureido 15N enrichment after continuous infusion of [2-15N]-glutamine in humans, pigs, rats, and mice. Values are means ± SEMs; n = 4 (humans), 5 (pigs), 6 (rats), and 5 (mice). The amino enrichment was greater (P < 0.001) than the δ enrichment, which was greater than the ureido enrichment in all species; species differences were not statistically analyzed because different infusion rates were performed. mpe, mole percent excess.
