The US National Institutes of Health says that it is not reversing its so-called "two strikes" rule that limits the number of times a researcher may resubmit a rejected a grant application, ScienceInsider reports.

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In PNAS this week: ancestry and admixture in Brazilians, characterization of novel double-stranded RNA mycovirus, and more.

Researchers report that what scents someone picks up can reflect their complement of immune genes.

The New York Times examines ethics and China's push to lead biomedical research.

At her blog, Sally Rockey dives into National Institutes of Health funding data.