The technology of RNAi triggers a natural gene silencing process that occurs when a virus invades a cell. As many viruses have double-stranded RNA, the cell has a built-in mechanism to attack this RNA: As double-stranded RNA enters the cell, an enzyme called Dicer chops it up into short 21-25 base-pair segments (called siRNA, for short interfering RNA or silencing RNA), which then combine with another group of enzymes to form a complex called RISC, or RNA-induced silencing complex.

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The president of France's National Research Agency has resigned, according to Nature News.

A senator wants a "right-to-try" provision in the US Food and Drug Administration funding bill, but an ethicist says at Stat News that it would undermine the role of clinical trials.

In PNAS this week: red algae Porphyra umbicalis genome, deep neural network model for sequencing peptides, and more.

The Guardian's Barbara Ellen has tried out some DNA testing services to see whether they provide valuable information.