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Definition of Transmethylation
1. Noun. (context: organic chemistry biochemistry) The transfer of a methyl group between molecules, especially between biological compounds such as amino acids or the components of nucleic acids ¹
¹ Source: wiktionary.com
Medical Definition of Transmethylation
1. 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)