This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, a Johns Hopkins University- and University of Iowa-led team describes a genome engineering scheme centered on a modified version of the piggyBac transposase enzyme and its corresponding transposon, which were used in combination with zinc finger proteins in the proof-of-principle study.

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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.