Figure 2From: Diurnal variation of phenylalanine and tyrosine concentrations in adult patients with phenylketonuria: subcutaneous microdialysis is no adequate tool for the determination of amino acid concentrations Variation of phenylalanine and tyrosine concentrations in serum over 24 hours. Profiles of phenylalanine (Phe) and tyrosine (Tyr) concentrations in serum of all patients during the 24-hour study visit. Time of main meals and bicycle ergometry is displayed.Back to article page