| transmethylation | Transfer of a methyl group from one compound to another; e.g., l-homocysteine is converted to l-methionine by the transfer to the latter of a methyl group. See: methionine synthase. (05 Mar 2000) |
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| transmethylation factor | <biochemistry> Esterified in the head group of phospholipids (phosphatidylcholine and sphingomyelin) and in the neurotransmitter acetylcholine. Otherwise a biological source of methyl groups. (18 Nov 1997) |