http://www.nytimes.com/2010/11/09/health/09brain.html
Genes as Mirrors of Life Experiences
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Studies suggest that such add-on, or epigenetic, markers develop as an animal adapts to its environment, whether in the womb or out in the world — and the markers can profoundly affect behavior.
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By studying genes at the “epi” level, scientists are hoping to discover patterns that have been elusive at the level of the genes
— and ideally to find targets for calibrated treatments that would not simply shut off errant genes but would gradually turn their activity up or down, like adjusting the balance on a stereo.
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