This Week in Nature

An international team led by investigators at the Salk Institute for Biological Studies in La Jolla, Calif., shows that Imp — IGF-II messenger RNA binding protein — counteracts endogenous small interfering RNAs to stabilize self-renewal factor upd RNA in Drosophila testis. "However, similar to upd, Imp expression decreases in the hub cells of older males, which is due to the targeting of Imp by the heterochronic microRNA let-7," the team writes.

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In a survey, about half of Canadian government scientists say they still feel as though they cannot speak freely, ScienceInsider reports.

The Atlantic reports that biohacker Josiah Zayner regrets injecting himself with the CRISPR gene-editing tool on stage.

Clinicians in China are moving ahead with a number of CRISPR trials, NPR reports, as the US embarks on its first.

In Nature this week: genomic approaches applied to study Neolithic and Bronze Age Europeans, and more.