Fig. 1.

Plasma (●) and muscle free (□) l-[1-¹³C]phenylalanine (A), l-[ring-²H₅]phenylalanine (B), l-[ring-3,5-²H₂]tyrosine (C), and l-[1-¹³C]leucine (D) enrichments [mole percent excess (MPE)] in the basal state and after ingestion of milk protein (38 g) in healthy young men (n = 7). Dashed line refers to protein ingestion. Data were analyzed with 1-way repeated-measures ANOVA (time). The least significant difference test was used to locate differences between means when significance was observed. *Different from basal (t = 0 min); #different from 0 to 60 min (P < 0.05). Data are means ± SE.