Epigenetics is not about the DNA sequence itself, but rather about how the DNA is managed and accessed. Generally it refers to the protein that helps to condense the DNA and make some parts more accessible than others. Really the more noticeable change would be in their RNA, which is the sequence of expressed genes.
Basically if your genome is a tape library, RNA is your local hard drive, which is pulling files as needed from the tape library. Your system RAM is, of course, protein.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/5F1P8vvOyXA/switching-tasks-changes-worker-bee-dna
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