NEW YORK (GenomeWeb News) – Sigma-Aldrich today reported second-quarter revenue growth of 4 percent but fell short of analysts' expectations for the top line.

The St. Louis-based research and chemical products firm reported total revenues of $664 million for the three months ended June 30, up from $637 million for the second quarter of 2011. Analysts, on average, expected sales of $674.7 million.

On an organic basis, Sigma-Aldrich's sales grew 3 percent. Acquisitions added 6 percent to sales growth, while currency exchange reduced its sales by 5 percent.

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Technology Review reports that researchers in the US have used CRISPR to modify a number of human embryos.

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