Methylation is an important reaction in the metabolism of many drugs, other xenobiotics and endogenous molecules. A methyltransferase is a type of transferase enzyme that transfers a methyl group from a donor to an acceptor. INMT (indolethylamine N-methyltransferase), also known as Temt or aromatic alkylamine N-methyltransferase, is a 264 amino acid protein belonging to the NNMT/PNMT/TEMT family. Localized to the cytoplasm, INMT catalyzes the N-methylation of tryptamine and structurally related compounds. Existing as a monomer, INMT may have a role in the in vivo synthesis of psychoactive compounds or neurotoxins. The gene encoding INMT maps to human chromosome 7p14.3 and mouse chromosome 6 B3.