O-methyltransferase: 5-hydroxyindole-O-methyltransferase/Acetylserotonin O-methyltransferase - Catechol-O-methyl transferase
homocysteine methyltransferase: Betaine-homocysteine methyltransferase - Homocysteine methyltransferase - 5-Methyltetrahydrofolate-homocysteine methyltransferase