NEW YORK (GenomeWeb News) – Shares of PerkinElmer were up 5 percent in late Thursday afternoon trade on the New York Stock Exchange after investment bank Thomas Weisel Partners upgraded the firm's stock to "overweight" from "market weight."

Peter Lawson, an analyst for the bank, also raised his price target on PerkinElmer's shares to $20 from his previous target of $18.

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In PNAS this week: genomic study of group B Streptococcus evolution, selection on the X chromosome in great apes, and more.

Changing the fat and fiber content of people's diets affects their gut microbiome, metabolome, and colon cancer risk, researchers say.

Broken links are found throughout academic publications, and some services are trying to combat such link decay.

Nick Stockton at Wired says that a pause in studying genome-editing tools should be used to find a path forward.