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.

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