The BCW Index fell 1.9 percent for the five-day trading period ended Tuesday, mirroring a drop in the broader stock market. For the tracking period, the Dow Jones Industrial Average fell 1.5 percent, the Nasdaq declined 1.6 percent, and the Nasdaq Biotech Index dropped 2.6 percent.
Fourteen of the 15 companies in the Index lost value, with Qiagen and Bruker BioSciences both falling 4 percent to lead decliners for the week. Stratagene was the only firm to gain ground, closing up 2.6 percent for the week.

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