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What is epigenetics? The term epigenetic is often used to describe a variety of unexpected patterns of gene regulation. Chemical modifications of chromosomal DNA and/or structures that change the pattern of gene expression without altering the DNA sequence. http://en.waleedabobatta.com/2018/03/28/introduction-to-epigenetics-science/ The Epigenome ™ The epigenome consists of the chemical compounds that tell DNA what to do, where to do it and when to do it , ™ All of which can be functions undertaken by any one of organism cells using the same identical DNA toolkit.         e.g . grow a finger vs. grow a nose, grow cancer vs fight cancer.  in other words, if DNA  is hardware and epigenome as the software that controls hardware .