3-methoxytyramine (3MT) generated by COMT after methylation of dopamine is oxidized into homovanillic acid (HVA) by monoamine oxidase A (MAOA), bound to its cofactor FAD (Guldberg et al. 1997).
Guldberg, HC, Sharman, DF, Tegerdine, PR
Esler, MD, Jennings, GL, Lambert, GW, Eisenhofer, G
primary amine oxidase activity of MAOA:FAD [mitochondrial outer membrane]
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