NEW YORK (GenomeWeb News) – Laboratory Corporation of America after the close of the market Monday priced $1 billion of senior notes in two tranches.

The clinical lab giant is offering $500 million of 2.2 percent senior notes due 2017 and $500 million of 3.75 percent senior notes due 2022. The notes bear interest from Aug. 23, 2012, payable in semi-annual installments on Aug. 23 and Feb. 23, beginning Feb. 23, 2013.

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In Science this week: factors influencing retrotransposon integration sites, and more.

A bioethicist argues for the responsible use of germline gene editing.

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