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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Mice in New York harbor both antibiotic-resistant bacteria and novel viruses, according to a new analysis of their fecal microbiomes.

Human Heredity and Health in Africa Initiative has issued guidelines for genomic research in the region, according to Nature News.

The Associated Press reports that an ethicist predicts that prenatal diagnosis and other advances will lead to more choices being available to prospective parents.

In Genome Biology this week: approach to analyze alternative polyadenylation, algorithm to predict transcriptomic structural variations, and more.