NEW YORK (GenomeWeb News) – More than half of the companies operating in the omics tools and molecular diagnostics space saw their stock prices drop in April, resulting in a sluggish GenomeWeb Daily News Index for the month.

Of the 29 firms in the GWDN Index, 16 declined during the past month, and overall the index inched up less than 1 percent. It trailed the Dow Jones Industrial Average and the Nasdaq, which grew a little less than 2 percent each, as well as the Nasdaq Biotech Index, which gained almost 8 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.