This Week in PNAS

Using the 18S ribosomal DNA gene as a barcode when looking at environmental samples may miss some members of the communities being tested, according to a study in the early, online edition of the Proceedings of the National Academy of Sciences this week by researchers based in the UK, Italy, Germany, and the US. In particular, authors of the study argue that the 18S marker underestimates the diversity of so-called meiofauna — microscopic invertebrate animals.

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The apple has traveled westward and eastward along the Silk Road, according to a new genetic analysis.

In Nature this week: GWAS data used to reposition drugs for psychiatric use, and more.

Genetic disease risk information doesn't always spur people to make healthy lifestyle changes, according to the Associated Press.

A University of California, San Diego-led team has used liquid biopsies to uncover possible treatments for patients with cancers of unknown primary.