An emerging frontier of science that invovles the study of changes in the regulation of gene activity and expression that are not dependent on gene sequence. For purposes of this program, epigenetics refers to both heritabel changes in gene activity and expression ( in the progeny of cells or of individuals) and also stable, long-term alteratiosn in the trascriptional potential of a cell that are not necessarily heritable. While epigenetics refers to the study of single genes or sets of genes, epigenomics refers to more global analyses of epigenetic changes across the entire genome

DNA: Deoxyribonucleic acid strand is a nucleic acid that contains the gneetic instructions used in the development and functioning of all known living organisms and some viruses.

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