This Week in Science

In this week's Science, two independent research groups report data showing that RNAi interference is used by mammals to fend off viral pathogens, as well as to control levels of endogenous genes. In one study, investigators looked at undifferentiated mouse embryonic stem cells, which lack an interferon immune response system, and found an accumulation of RNAi molecules after viral challenge.

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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.