The BCW Index recorded a 1.42 percent drop this past week, as 12 of the 16 components lost ground. Leading the group of decliners was Bruker BioSciences, which fell 6.1 percent.

Molecular Devices led the four firms that reported gains for the tracking period ended Tuesday, with an increase of 5 percent. The firm reported its fourth-quarter 2005 results earlier today (see briefs).

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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.