NEW YORK (GenomeWeb) – Fitch Ratings said today that it has granted a BBB rating to Thermo Fisher Scientific's seven-year senior notes offering with a Stable rating outlook.

The rating agency said it expects the company to use the proceeds of the issue to redeem the outstanding $1 billion principal amount of its 2.25 percent senior notes due August 15. The ratings apply to $12.5 billion of debt as of Dec. 31, 2015.

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Jay Shendure and his colleagues have developed a new method to more comprehensively identify human cell types, the NY Times reports.

Researchers in the UK and Japan have shown that infertility in mice with three sex chromosomes can be overcome, according to the Guardian.

China is embracing preimplantation genetic diagnosis, Nature News reports. 

In PLOS this week: host genetic factors associated with cervical neoplasia progression, population patterns for an ancient flowering rainforest plant, and more.