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plural transmethylations
(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. quotations examples
It was realized that direct proof of the transfer of the methyl group (transmethylation) was highly desirable.
1940 July, V Du Vigneaud, “The transfer of the methyl group from methionine to choline and creatine”, in The Journal of Biological Chemistry, page 787