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[15N]- (A) and [2H2]arginine (B) isotopic enrichments in arterial (A), portal (P), and renal (R) vein plasma of neonatal (7-day-old) and young (35-day-old) pigs. Bars are means ± SE; n = 6 for neonates and 5 for the young pigs. **P < 0.01, significant differences from the corresponding arterial plasma.
