This Week in Nature

Dave Bartel's lab at MIT has checked in on the origins of small RNAs, finding miRNAs and piRNAs from animal phyla that diverged before the emergence of the Bilateria, including the starlet sea anemone and the sponge. The anemone has many miRNA genes, two classes of piRNAs, and a complement of proteins specific to small-RNA biology comparable to that of humans.

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A fire at a Manchester hospital may have destroyed lab equipment and data, the Guardian reports.

Researchers generate a genetic database from skeletal remains from the 1845 Franklin Expedition to the Arctic, Live Science reports.

Researchers in China have begun another trial using CRISPR/Cas9 approaches in cancer patients, according to the Wall Street Journal.

In Science this week: human DNA found in sediments from archeological sites lacking bones, and more.