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methylation

noun

meth·​yl·​a·​tion ˌme-thə-ˈlā-shən How to pronounce methylation (audio)
: the introduction of a methyl radical into a substance
The methylation of metals (that is, the substitution of a metal atom for the hydrogen atom of the hydroxyl group of a methyl alcohol molecule) can result in the metal's becoming volatile. Corale L. Brierley
especially : dna methylation
As cells begin to specialize into adult tissues, methylation seems to inactivate genes that are no longer needed. John Travis

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