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DNA methylation is a unique mechanism used to silence portions of the DNA molecule.
Methylation involves the addition of a methyl ($CH_3$) group to the cytosine of CG doublets in DNA, and it is
an epigenetic mechanism found both in eukaryotes and prokaryotes to control gene expression.
an epigenetic mechanism found in prokaryotes to expose their DNA to restriction endonucleases.
a mechanism to enhance retroviral gene expression in a eukaryotic host.
a mechanism to support histone acetylation in areas of inactive gene expression.