An Arrowhead Research official this week denied reports that concerns over potency or toxicity have prompted the company to expand a phase I trial of its investigational hepatitis B treatment ARC-520, which has just moved into phase IIa testing.

According to Vince Anzalone, vice president of finance at Arrowhead, "regulators did not ask us to go back to dose more healthy volunteers and there were no safety signals of concern" in the phase I study.

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The Jackson Laboratory has filed a complaint accusing Nanjing University of breeding and re-selling its mouse models, the Hartford Courant reports.

Oxford researchers are turning to virtual reality to visualize genes and regulatory elements, Phys.org says.

In Science this week: neutrophils rely on microRNA to protect against lung inflammation, and more.

China is moving forward with plans to sequence a million citizens, the Wall Street Journal reports.