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FPM of arginine as a percentage of total arginine infused intragastrically (A) or as an absolute rate (B) in mice infused intragastrically with a dextrose/amino acid mixture containing different amounts of CIT and ARG. The slope of FPM in panel A for citrulline was not different from zero (P = 0.50; not shown for clarity of presentation). Values are means ± SEMs, n = 6–9. ARG, supplemental arginine; CIT, supplemental citrulline; FPM, first-pass metabolism.
