Arrowhead Research last week released new preclinical data on its lead drug candidate, the hepatitis B virus treatment ARC-520, reporting that the agent could trigger up to multi-log reductions in the levels of circulating viral antigens, while lowering levels of the virus' replicative intermediates, in mouse models.

The company also provided new non-human primate data on its recently acquired dynamic polyconjugate siRNA-delivery system, showing that tweaks to the technology have enabled subcutaneous delivery with near complete target knockdown.

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Nature has retracted a 2002 epigenetics paper for image manipulation.

The World Health Organization calls for the public release of clinical trial results within a year of the completion of data collection.

In Science this week: measles virus nucleocapsid structure, and more.

African and US health officials work to establish an Africa-wide Centres for Disease Control and Prevention.