hyperphenylalaninemia produced greatly disrupted brain amino acids at 10 days of age ( prior to the formalization of the blood-brain barrier and specific transport systems ) which was limited by 30 days of age to changes in glycine , gamma-aminobutyric acid and the aliphatic and aromatic amino acids which compete for uptake in the brain by a common carrier .
C0002520
amino acids
C0017890
glycine