NEW YORK (GenomeWeb News) – Shares of Affymetrix and Helicos BioSciences dropped sharply in October, as 28 of the 34 stocks in the GenomeWeb Daily News Index lost value during the month.

Those two firms were the biggest decliners among a group of five stocks that dropped more than 20 percent. Affy fell 40 percent and Helicos dropped 34 percent, while Decode Genetics tumbled 33 percent amid its continued financial difficulties, Illumina sank 24 percent, and Caliper Life Sciences fell 22 percent.

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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.