Researchers at Rockerfeller University have found that acute stress leaves epigenetic marks on the hippocampus. One single 30-minute episode of acute stress caused a rapid chemical change in DNA packaging proteins called histones in the rat hippocampus, a brain region known to be especially susceptible to the effects of stress in both rodents and humans. The chemical change, called methylation, can either increase or decrease the expression of genes that are packaged by the histones, depending on the location of the methylation. (http://www.physorg.com/news178271825.html)

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