This Week in PNAS

Researchers from the US, Germany, Australia, and Peru included mitochondrial DNA sequence data in their analysis of pre-Columbian population patterns in Peru. The team sequenced hyper-variable 1 regions in mtDNA from more than 200 ancient individuals from southern Peru. Together with existing mtDNA data, the sequences suggested that at least two large migrations and related cultural shifts occurred in the region.

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Lawmakers have asked four direct-to-consumer genetic testing companies to explain their privacy policies and security measures, according to Stat News.

The Trump Administration has proposed a plan to reorganize the federal government, the Washington Post reports.

In Science this week: genetic overlap among many psychiatric disorders, and more.

The Economist writes that an increasing number of scientific journals don't do peer review.