Definition of "methylation" []

• The addition of a methyl group to a molecule (noun)
• The addition of a methyl group to cytosine and adenine residues in DNA that leads to the epigenetic modification of DNA and the reduction of gene expression and protein production (noun)

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• "Amplicon sequence reads corresponding to the BS-PCR products were aligned to the Human Reference Genome, and the extent of methylation (DNA methylation%) was determined by comparing the total number of Cs"
• "Certain genes in some of the samples showed changes, which are known as methylation, that are thought to precede the development of cancer."
• "The methylation is linked with the development of lung cancer."