This Week in Nature

In Nature this week, a team from Uppsala University presents genetic data suggesting that tooth enamel may have originated in fish. While enamel is unique to vertebrates, fossils and certain primitive species of fish alive today have an enamel-like tissue called ganoine on their scales.

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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.