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Phenylalanine blood levels of the substudy patient cohort over the study period. Phe target range was 120–360 µmol/L for patients ≤12 years and 120–600 µmol/L for patients >12 years. (Note: Sample labelling issue for Subject 3 on Day 7, so no result recorded). Abbreviation: Phe: phenylalanine.
