TIME Sep 10, 2010
Jeffrey Kluger

Over the years, a large body of work has been devoted to studying PTSD symptoms in second-generation survivors, and it has found signs of the condition in their behavior and even their blood - with higher levels of the stress hormone cortisol, for example. The assumption - a perfectly reasonable one - was always that these symptoms were essentially learned.
Now a new paper adds another dimension to the science, suggesting that it's not just a second generation's emotional profile that can be affected by a parent's trauma; it may be their genes too.

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