L-Tyrosine-(phenyl-d4) is one of the labeled with stable isotopes of an aromatic amino acid, L-tyrosine. L-Tyrosine serves as a biomarker for detecting phenylketonuria, including in neonatal screening, and for monitoring other metabolic disorders such as tyrosinemias. Furthermore, its isomers are used as markers of oxidative stress (e.g., in sepsis), and L-tyrosine level measurements are conducted in metabolomic research.
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