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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 polymerases are a group of enzymes that use single-stranded DNA as a template for the synthesis of the complementary DNA strand. This family of enzymes plays an essential role in nucleic acid metabolism, including the processes of DNA replication, repair and recombination.