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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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Australia will not be regulating gene editing of plants, animals, and human cell lines as long as no new genetic material is incorporated, reports Nature News.

The Washington Post reports that the US Department of Agriculture told its researchers to label peer-reviewed articles as "preliminary" work.

Researchers have sequenced the genomes of both the coast redwood and the giant sequoia, according to the San Francisco Chronicle.

In PNAS this week: study of epigenetic patterns in mammalian eggs, clonal expansion patterns in CD8+ T cells, and more.