Shares of Bruker Biosciences gained 13.4 percent for the trading week ended Tuesday, reversing a 7-percent decline the week before. The firm led the seven companies in the BCW Index that gained ground for the tracking period. Stratagene led decliners in the Index with a drop of 9.3 percent. Its shares reached a 52-week low of $5.51 on Tuesday before closing at $5.67.

Overall, the Index gained .1 percent for the week. In comparison, the Dow Jones Industrial Average fell .5 percent, the Nasdaq dropped .3 percent, and the Nasdaq Biotech Index declined .7 percent.

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