A step toward understanding the oxygen activation by copper containing enzymes Figure 2. [The tyrosine degradation pathway. Alkaptonuria]. GeneReviews NCBI Bookshelf Oxidation of protein tyrosine or methionine residues: From the amino acid to the peptide Kinetic analyses of two steps oxidation from l tyrosine to l dopaquinone with tyrosinase by capillary electrophoresis dynamic frontal analysis ScienceDirect L Tyrosine vs. Dextroamphetamine In a sleep deprivation study, L Tyrosine actually outperformed one of Adderall's active stimulants (dextroamphetamine) in key cognitive tests, like mathematical processing and logical reasoning, even after 30 hours with Elucidation of the tyrosinase O2 monophenol ternary intermediate that dictates the monooxygenation mechanism in melanin biosynthesis PNAS