Researchers from the US, France, and Russia report on efforts to dial back the set of amino acids encoded by the Mycoplasma genitalium genome as a means of reducing the minimal genome size for the bacterial species. Using computational methods, the team looked at the possibility of reining in or completely replacing cysteine, the rarest amino acid residue in that microbe.

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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.