This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, researchers from the US and Germany explore potential ties between gut microbes and bee body weight in the honeybee, Apis mellifera. The team compared everything from body weight to metabolite and transcript expression in the guts of germ-free honeybees and honeybees with typical gut microbial communities.

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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.