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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NPR reports that Turkish high school students will no longer study evolution.

Researchers report they sequenced and identified plant species in an "al fresco" laboratory.

An Australian team searches for genetic alterations linked to depression in hopes of developing personalized treatments, the Sydney Morning Herald reports.

In PNAS this week: host contributors to typhoid fever risk, effects of obesity-related variants near TMEM18, and more.