In a column at The Scientist, Retraction Watch bloggers Ivan Oransky and Adam Marcus say it's time to devise a "transparency index" for journals to grade how well they share information about retractions, corrections, and the like with their readers. It has been suggested that journals publish a "retraction index" number along with their impact factors, to show how many papers they retract for every 1,000 they publish.

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In PNAS this week: optical mapping allows glimpse of structural variants, disease-linked GATA2 mutations boosts its protein activity, and more.

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.