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Mean (±SEM) muscle protein-bound l-[1-13C]phenylalanine enrichments (MPE) at 2 and 6 h following the ingestion of 20 g of intrinsically l-[1-13C]phenylalanine-labeled protein plus 40 g of carbohydrate in healthy young (n = 12) and older (n = 12) men. No significant differences were observed between groups
