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Plasma isotopic enrichment time course of infused [13C6]arginine (Arg) and its products {[13C5]ornithine (Orn) and [13C5]citrulline (Cit)} in neonatal piglets during fasting (0–3 h) and feeding (3–11 h). During feeding, tracers were infused iv (3–7 h) and ig (7–11 h). mpe, Mole %excess.
