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Dihydroxyphenylalanine (DOPA) is an amino acid produced by the oxidation of tyrosine by the enzyme tyrosinase. It is an intermediate in the catabolism of phenylalanine and tyrosine, and as a precursor to dopamine and norepinephrine, epinephrine, and melanin.

L-dopa, the naturally occurring form, and levodopa, a synthetic form, are used in the treatment of Parkinsonism and manganese poisoning.

Stedman, Thomas Lathrop. Stedman's Medical Dictionary. 24th edition. Baltimore: Williams and Wilkins, 1982.

Thomas, C.L. 1985. Taber's Cyclopedic Medical Dictionary. F.A. Davis Co. Pub., Philadelphia. 2170.


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