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Leucine (LEU) is recognized as a major regulator of muscle protein synthesis (MPS). Citrulline (CIT) is emerging as a potent new regulator. The aim of our study was to compare MPS modulation by CIT and LEU in food-deprived rats and to determine whether their action was driven by similar mechanisms. Rats were either freely fed (F, n = 10) or food deprived for 18 h. Food-deprived rats were randomly...