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Effect of dietary protein restriction on whole body amino acid kinetics in rats. Whole body rate of appearance of serine, methionine, and phenylalanine were measured in awake resting rats. The rate of appearance of methionine was measured using [13C,2H3]methionine and [1-14C]methionine tracers. *, p = 0.03; §, p = 0.06 compared with normal protein group. LP, dark bar; NP, clear bar.
