This Week in PLoS

Scientists tested three theories as to why gene order within operons doesn't appear to be random when it comes to the order of enzymes needed in metabolic pathways. Studying E. coli and "employing deterministic and stochastic models of enzyme kinetics," the Hungarian researchers found that the theory of stochastic stalling -- if an operon is not often expressed, then all the proteins for this part of metabolism can be lost -- is supported.

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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.