Tyrosinase Expressing Neuronal Cell Line as in Vitro Model of Parkinson's Disease 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 Catalytic mechanism of the tyrosinase reaction toward the Tyr98 residue in the caddie protein PLOS Biology