Dictionary of Human Evolution and Biology

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3,4-dihydroxyphenylalanine; an amino acid produced by oxidation of tyrosine by monophenol monooxygenase. Dopa is the precursor of dopamine and an intermediate product in the biosynthesis of norepinephrine, epinephrine, and melanin. The naturally occurring form is L-dopa, as dopa is levorotatory.

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From "Dictionary of Nursing and Individual Health Care"