This Week in PNAS

Francis Collins and colleagues from the National Human Genome Research Institute, the Lawrence Berkeley National Laboratory, the University of California, San Francisco, and the US Department of Energy's Joint Genome Institute report on a role for so-called stretch enhancers in cell type-specific gene expression.

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National Geographic reports that marine mammals have lost a gene that could make them more susceptible to organophosphate damage.

NPR reports on Human Cell Atlas Consortium's effort to catalog all the different cell types within the human body.

The Union of Concerned Scientists surveyed US government scientists about Trump Administration policies and more, Science reports.

In PNAS this week: history and genetic diversity of the scarlet macaw, approach for predicting human flu virus evolution, and more.