methylation

/M EH1 TH AH0 L EY1 SH AH0 N/
noun
  1. 1

    (genetics) 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.

  2. 2

    (chemistry) The addition of a methyl group to a molecule.

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