this enzyme-radioimmunoassay for the measurement of l-dopa , dopamine , and 3-o-methyldopamine is based on the incubation of urine in the presence of catechol-o-methyltransferase , aromatic-l-amino-acid decarboxylase , and s-adenosylmethionine .
C0013030
dopamine
C0011498
methyldopamine