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In Biology, epigenetics can be defined as the study of "all heritable and potentially reversible changes in genome function that do not alter the nucleotide sequence within the DNA."[1] When a cell undergoes an epigenetic change, it is the phenotype of the cell that is affected. Epigenetic events during embryo development lead to the differentiation of fetal cells. The combined processes of fetal development and cell differentiation are called epigenesis. The term is also sometimes used as a synonym for the closely related topic of chromatin remodeling.