Shares in Stratagene fell 3.1 percent for the trading week ended Tuesday. The decline followed last week's drop of 23.3 percent, but the reasons for its fall remain unclear. Stratagene's shares finished Tuesday at $7.16 hovering above a 52-week low of $6.42 reached last September. Bruker led gainers for the week with a 6.3-percent rise.

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