This Week in PNAS

In the early, online version of the Proceedings of the National Academy of Sciences, a group from Germany and the US looks at whether post-traumatic stress disorder stemming from childhood events coincides with distinct gene expression and epigenetic profiles in individuals' blood samples.

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In Nature this week: omic analysis of permafrost microbes, hookworm genome, and more.

Biologists turn to environmental DNA sampling to determine whether elusive or invasive species are shedding DNA in a given area.

Rob Knight writes at Scientific American that microbiome studies are about to break out of the laboratory.

Harold Varmus, the director of the National Cancer Institute, has announced that he is stepping down after nearly five years.