NEW YORK (GenomeWeb News) – Sigma-Aldrich today reported its third-quarter sales grew 2 percent year over year on soft demand from its research end markets and a 6 percent negative effect from foreign currency exchange.

The St. Louis-based chemicals and research products firm reported total sales of $639 million for the three months ended Sept. 30 compared to $626 million in sales for the third quarter of 2011. It fell short of Wall Street's consensus estimate of $657.6 million.

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