Introduction

In biology, epigenetics is the study of mitotically and/or meiotically heritable changes in gene function that cannot be explained by changes to the DNA sequence. Epigenetics normally involves change that is not erased by cell division and that also affects the regulation of gene expression. Epigenetics reflects our understanding that, despite the complement of DNA being fundamentally identical in all somatic cells of an organism, patterns in gene expression can vary greatly among different cell types. Additionally, these patterns have the potential for clonal inheritance.

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