Shares in Bruker BioSciences gained 11.4 percent over the past three weeks, leading the 11 firms whose shares rose during the three-week trading period ended Tuesday (Note: BioCommerce Week did not publish the past two weeks). Bio-Rad posted the next-largest increase with a gain of 6.8 percent.
Stratagene slumped again to a new 52-week low to close at $4.70 on Tuesday, down 14.4 percent for the three-week period.

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