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[DOI] [PMC free article] [PubMed] [Google Scholar] 61.Huang Y., Li W., Su Z.-y., Kong A.-N.T

The major methyltransferases are: COMT (catechol-O-methyltransferase) : inactivates catecholamines (dopamine, norepinephrine, epinephrine), catechol estrogens, and catechol drugs (L-DOPA) R HNMT (histamine N-methyltransferase) : the primary intracellular histamine degradation enzyme in the brain and peripheral tissues R INMT (indolethylamine N-methyltransferase) : methylates tryptamine, serotonin, and other indoleamines R NNMT (nicotinamide N-methyltransferase) : methylates nicotinamide (vitamin B3) and other pyridines R TMT (thiol S-methyltransferase) : S-methylates thiol drugs (captopril, D-penicillamine) and thiol metabolites R TPMT (thiopurine S-methyltransferase) : methylates thiopurine drugs (azathioprine, 6-mercaptopurine) used in autoimmune disease and cancer R Methylation capacity depends on the methylation cycle: methionine to SAM-e to SAH to homocysteine, recycled back to methionine by methionine synthase (B12-dependent) or BHMT (betaine-dependent)

Our study paves the way for future cell-based applications of LaccID

They ingested increasing doses of niacin (250-1000 mg daily) for 16 weeks as described previously 15 , and the blood samples were taken in different timepoints during the supplementation