This Week in Science

In a paper published online in advance in Science this week, researchers at the University of Virginia School of Medicine and the University of North Carolina at Chapel Hill, report on their identification of tens of thousands of "short extrachromosomal circular DNAs — microDNA — in mouse tissues as well as mouse and human cell lines." The team says these 200- to 400-base pair long microDNAs are "derived from unique nonrepetitive sequence, and are enriched in the 5' untransla

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The UK's Human Fertility and Embryology Authority calls for consumer genetic testing companies to warn customers that testing could uncover family secrets, according to the Guardian.

The New York Times reports that United Nations delegates have been discussing how to govern the genetic resources of the deep sea.

Researchers have transplanted edited cells into mice that appear to combat cocaine addiction, New Scientist reports.

In PNAS this week: analysis of proteolytic enzymes secreted by circulating tumor cells, phylogenetic study of Fv1 evolution, and more.