has role L-tyrosine An optically active form of tyrosine having L-configuration. tyrosine micronutrient D-tyrosine L-tyrosinate(1-) L-tyrosinium L-tyrosinal nutraceutical L-tyrosine zwitterion EC 1.3.1.43 (arogenate dehydrogenase) inhibitor erythrose 4-phosphate/phosphoenolpyruvate family amino acid fundamental metabolite