This Week in Science

In Science this week, the University of California, Berkeley's Jennifer Douda and colleagues report the crystal structures of two Cas enzymes involved in CRISPR genome editing, as well as cryo-electron microscopy structure of the full CRISPR locus integration complex, providing new insights into how components of the system interact with one another as a viral defense mechanism for bacteria.

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The apple has traveled westward and eastward along the Silk Road, according to a new genetic analysis.

In Nature this week: GWAS data used to reposition drugs for psychiatric use, and more.

Genetic disease risk information doesn't always spur people to make healthy lifestyle changes, according to the Associated Press.

A University of California, San Diego-led team has used liquid biopsies to uncover possible treatments for patients with cancers of unknown primary.