Identical twins may not have identical DNA, says this New York Times article. According to new research published in the March issue of The American Journal of Human Genetics, scientists who studied genes of 10 pairs of identical twins found that not only do epigenetic changes abound, but copy number variations at the DNA level are also prevalent.

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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.