catecholamine biosynthesis dopamine biosynthesis UPa:UPA00747 Biosynthesis of dopamine (DA; 4-(2-aminoethyl)benzene-1,2-diol), a catecholamine neurotransmitter and a metabolic precursor of adrenaline (epinephrine), noradrenaline (norepinephrine). KEGG:map00965 GO:0042416 4-(2-aminoethyl)benzene-1,2-diol biosynthesis DA biosynthesis KEGG:map00350 pathway KEGG:map01100 KEGG:map01110 KEGG:map00950