This Week in PNAS

In the early, online edition of the Proceedings of the National Academy of Sciences, researchers from the US, Italy, and Canada outline findings from a genomic study of infectious Streptococcus evolution. The team focused on the multilocus sequence type 1 in the invasive serotype V group B Streptococcus (GBS) — a form of the pathogen previously found to be a prevalent in non-pregnant individuals with GBS infections in the US and Canada over the past two decades or so.

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The US Food and Drug Administration has new guidelines that enable some gene and cell therapies to undergo expedited review, according to the New York Times.

Using gene drives to control invasive species might be too risky, an initial advocate of the approach says.

In Science this week: intellectual property experts argue patent battles such as the one over CRISPR are wasteful, and more.

Researchers have grown tumors in 3D cell cultures to better understand cancer, the Economist reports.