This Week in PNAS

Two open access papers published this week in PNAS score for systems biology. Neuroscientists at Yale, Harvard, and the Burnham Institute report that when they implanted undifferentiated human neural stem cells into primates made to show symptoms of Parkinson's disease, some of these cells improved behavior and increased dopamine levels.

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Labs in the US and South Korea are hoping to bring the woolly mammoth back from beyond extinction, Newsweek writes.

Geneticist Adam Rutherford speaks with National Geographic about paleogenetics, race, and more.

Researchers link genetic links between education and smoking and longevity.

In PNAS this week: influence of gene environment interactions on polygenic traits, epigenetic features affecting fruit fly foraging, and more.