But it's unclear if alterations cause the disorder
People with post-traumatic stress disorder seem to accumulate an array of chemical modifications to their DNA that are different from those found in healthy people, researchers report online May 3 in the Proceedings of the National Academy of Sciences.
The new findings, while showing differences between people with and without PTSD, don't shed light on whether these differences might play a role in PTSD, says study coauthor Sandro Galea, a physician and epidemiologist at Columbia University in New York City.
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