The BCW Index, led by strong gains for two of its components, finished the trading week ended Tuesday up 2.8 percent. Beckman Coulter and Molecular Devices led the way, posting double-digit gains for the week. Beckman, whose shares were upgraded last week by investment bank Bear Stearns to "outperform" from "peer perform," rose 11 percent for the tracking period, while Molecular Devices gained 12.4 percent on no news at all.

Only four of the 16 firms in the Index lost value during the week, led by Qiagen, which dropped 1.9 percent.

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The US National Institutes of Health and the Food and Drug Administration have proposed changing gene therapy oversight, the Associated Press reports.

Nature News reports that the Salk Institute has asked for the scope of a gender discrimination lawsuit brought against it to be narrowed.

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In PLOS this week: genotyping of indigenous North African goats, program to simulate evolve and resequencing studies, and more.