>Identical twin studies often show dramatic differences between the epigenetics of the two twins. We know sending someone into space for a while causes all kinds of epigenetic marks to be added. Yet there is very little evidence that those differences result in anything phenotypical that can be measured. So, are they really important at all?
Dr. Hurd addresses this question in his talk as well - starting at about the 15 minute mark, he outlines items that can be predicted genetically versus those that cannot (i.e. epigenetic factors).
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