This Week in Science

In Science this week, investigators from Oak Ridge National Laboratory report on the genetic basis for mercury methylation, the process of converting mercury into the neurotoxin methylmercury, by bacteria. The team examined the genomes of two sulfur-reducing bacteria — Desulfovibrio desulfuricans ND132 and Geobacter sulfurreducens PCA — and found that two genes, if deleted alone or together, abolishes the organisms' ability to process mercury.

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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.