an amino acid, C9H11NO4, formed from tyrosine in the liver during melanin and epinephrine biosynthesis: the L-dopa isomer is converted in the brain to dopamine.
Main Entry: do·pa Pronunciation: 'dO-p&, -(")pä Function: noun : an amino acid C9H11NO4 that in thelevorotatory form is found in the broad bean and is used in the treatment of Parkinson's disease called also dihydroxyphenylalanine