This Week in Science

In this week's Science, a team led by University of California, Berkeley, researchers report on how Cas9, the enzyme used by the genome-editing tool CRISPR to make double-strand breaks in DNA, does its work. The scientists studied the crystal structures of Cas9 from the bacteria Streptococcus pygoenes bound to a guide RNA at 2.9 angstroms resolution.

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The Seattle Times writes that pharmacogenomics testing can help choose medications that may work best for people with depression.

Researchers report that deleting one gene from butterflies affects their wing coloration patterns, according to the Washington Post.

In PNAS this week: genome sequencing of weevil symbionts, retinoid X receptor deletion in lung cancer metastasis, and more.

Sequencing could help combat foodborne illnesses, according to a blog post by Food and Drug Administration officials.