NEW YORK (GenomeWeb News) – The stock of Quest Diagnostics this week was downgraded by Zacks Equity Research to Underperform. In a statement, the investment research and information firm noted a drop in Quest's revenues and earnings-per-share for continuing operations in the fourth quarter, as well as a "disappointing outlook" for the first quarter of 2013.

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Researchers suggest that genetic variations could influence the side effects people experience when using synthetic cannabinoids, the International Business Times reports.

An analysis has examined the makeup of researchers on Twitter and what they share, Nature News reports.

At Stat News, Jim Kozubek argues that the Broad Institute is pushing the boundary of what a nonprofit is.

In PNAS this week: gut microbes may affect honeybee weight, phenotype and gene expression changes in DiGeorge syndrome, and more.