The BCW Index dropped .67 percent for the week ended Tuesday, mirroring a broader drop in the stock market. The Dow Jones Industrial Average fell 1 percent, the Nasdaq slipped .8 percent, and the Nasdaq Biotech Index dropped 1.1 percent for the tracking period.

Bruker BioSciences had the steepest decline, falling 7.5 percent for the week, while Harvard Bioscience had a setback to its recent rise, dropping 6.9 percent for the week. Thermo Electron led the six stocks that reported gains for the week, rising 2.6 percent.

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