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 Science this week: International Wheat Genome Sequencing Consortium publishes the bread wheat cultivar Chinese Spring reference genome, and more.

At his FDA Law Blog, Jeffrey Gibbs discusses FDA's technical assistance for the draft Diagnostic Accuracy and Innovation Act.

The New York Times reports that genetic testing has uncovered unfaithful penguins at a Utah aquarium.

Cancer researcher loses funding under new Wellcome Trust anti-bullying policies, the Guardian reports.