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Equally important and coupled with DNA methylation is DNA demethylation, the removal of a methyl group. The demethylation process is necessary for epigenetic reprogramming of genes and is also directly involved in many important disease mechanisms such as tumor progression.
DNA Polymerase's role is in DNA replication. DNA Polymerase is an enzyme that essentially reads an intact DNA strand as a template and uses it to synthesize the new strand. This process copies a piece of DNA.