This Week in Science

In a report published online in advance in Science this week, University of Cambridge's Eric Miska and his colleagues discuss the roles of piwi-interacting RNAs in Caenorhabditis elegans. "Our data suggest that nematode piRNA clusters are evolving to generate piRNAs against active mobile elements," Miska et al. write. "Thus, piRNAs provide heritable, sequence-specific triggers for RNAi in C. elegans."

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Technology Review reports that researchers in the US have used CRISPR to modify a number of human embryos.

By introducing genes from butterfly peas and Canterbury bells, researchers in Japan have developed a blue chrysanthemum, according to NPR.

Plant researchers plan to sequence some 10,000 samples that represent the major plant clades, ScienceInsider reports.

In Nature this week: a Danish reference genome, and more.