This Week in PNAS

Using molecular techniques, scientists led by Harvard's Jacob Russell and Corrie Moreau have studied gut microbes in ants to find patterns of symbiosis. Surveying 283 species from 18 of the 21 ant subfamilies, they found "a wealth of bacteria from across the ants." Herbivorous "turtle ants" often had symbiotic bacteria from clades within the Burkholderiales, Pseudomonadales, Rhizobiales, Verrucomicrobiales, and Xanthomonadales.

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Researchers suggest that genetic variations could influence the side effects people experience when using synthetic cannabinoids, the International Business Times reports.

An analysis has examined the makeup of researchers on Twitter and what they share, Nature News reports.

At Stat News, Jim Kozubek argues that the Broad Institute is pushing the boundary of what a nonprofit is.

In PNAS this week: gut microbes may affect honeybee weight, phenotype and gene expression changes in DiGeorge syndrome, and more.