This Week in PNAS

In the PNAS Early Edition this week, Sunny Wong and Jeremy Reiter show that wounding recruits stem cells from the hair-follicle bulge and secondary hair germ to the injury site and that the downstream Hedgehog "signal transduction is de-repressed, giving rise to superficial BCC [basal cell carcinoma]-like tumors," which serves to explain, in part, the documented relationship between wounding and tumorigenesis.

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A new study in JAMA finds that genetic tests might not be able to determine what diet is right for someone seeking to lose weight.

A genome-wide association study that linked common genetic variants to salivary gland carcinoma risk has been retracted, according to Retraction Watch.

Vampire bats' ability to live off blood is etched in their genomes and gut microbiomes, the Scientist reports.

In Genome Biology this week: peopling of the Sahara, epigenetic reprogramming analysis of liverwort, and more.