This Week in Science

In this week's Science, a team led by University of California, Berkeley, researchers presents new details about how the genome-editing technology CRISPR/Cas9 identifies and positions its target DNA. In the CRISPR process, the enzyme Cas9 is directed to its target by an RNA-DNA hybrid helix in an R-loop formation.

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 Senator Lamar Alexander (R-Tenn.), who chairs the Senate health committee, will be retiring at the end of his term, Stat News reports.

UCSF researchers find that having two X chromosomes may contribute to women's longer lifespans, according to Discover's D-brief blog.

The Wall Street Journal reports on the US Centers for Disease Control and Prevention's use of genetic approaches to study foodborne illnesses.

In PNAS this week: immune cell profiling of wild baboons by social status, metabolomics profiling of esophageal tumors, and more.