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Epigenetics is the study of changes in gene expression that occur without altering the DNA sequence. The Greek prefix epi- (???- "over, outside of, around") in epigenetics implies features that are "on top of" or "in addition to" the traditional DNA-sequence-based mechanism of inheritance. Epigenetics usually involves changes that persist through cell division, and affect the regulation of gene expression. Such effects on cellular and physiological traits may result

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