Story | Mar 5, 2008
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Story | Sep 6, 2011 | 11:35 AMTen years after terrorists hijacked four American jetliners and killed nearly 3,000 people, there's growing evidence that people with a previous history of depression, or who have been traumatized before, are far more vulnerable to developing post-traumatic stress disorder (PTSD) than those without such histories. A new study suggests why, and supplies yet more evidence that genes play a powerful role in influencing who develops post-traumatic stress disorder after a traumatic event and who doesn't.