Histamine N-Methyltransferase

**Definition:** An enzyme that catalyzes the transfer of a methyl group from S-adenosylmethionine to histamine, forming N-methylhistamine, the major metabolite of histamine in man. EC 2.1.1.8.

**Tree numbers:** - D08.811.913.555.500.500

**Synonyms:** - Histamine Methyltransferase