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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Cancer researcher Alan Rabson has died at 92, the New York Times reports.

As the National Guideline Clearinghouse goes dark, the ECRI Institute says it will pick up the slack.

In Genome Research this week: sequencing method examines proteins parasite uses to evade immune system, L1 insertions in cancer, and more.

The Atlantic reports on private Facebook support groups for people who receive unexpected parentage results from direct-to-consumer genetic tests.