The BCW Index rose .9 percent for the week ended Tuesday, outgaining the Nasdaq, which rose .2 percent for the tracking period, and the Nasdaq Biotech Index, which climbed .7 percent. The Dow Jones Industrial Average declined .3 percent.

Shares of Bruker BioSciences rose 4.3 percent to lead the Index, while Harvard Bioscience continued its recent ascent with a 4 percent gain for the week. Only four firms in the Index posted declines this week, led by a 1.7 percent dip for Bio-Rad Laboratories.

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