This Week in Science

In Science this week, a group of Chinese researchers report on the use of reverse genetics to gain insights into how H5N1 avian flu can spread to, and between, mammals. In the past, avian flu viruses have crossed species barriers by reassorting with mammal-infective viruses in intermediate livestock hosts. The team created 127 reassortant viruses between a duck isolate of H5N1 and a highly transmissible human H1N1 virus.

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Senator Elizabeth Warren (D-Mass.) has released the results of a genetic ancestry analysis, the Boston Globe reports.

Retraction Watch's Ivan Oransky and Adam Marcus report that Harvard Medical School and Brigham and Women's Hospital have recommended that more than 30 papers from a former researcher be retracted.

Thomas Steitz, who won the 2009 chemistry Nobel Prize for his ribosome work, has died, the Washington Post reports.

In PLOS this week: mechanisms for genes implicated in coronary artery disease, rumen microbes and host genetics influence cow methane production, and more.