This Week in PNAS

Human parvovirus B19 has been associated with humans for a thousand years, according to a new study appearing the Proceedings of the National Academy of Sciences this week. An international team of researchers screened shotgun DNA samples obtained from 1,578 ancient human individuals who lived across Eurasia, Southeast Asia, and Greenland for hints of human parvovirus B19.

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A University of California, Los Angeles-led team has found turning off the CCR5 gene could improve recovery after a stroke, according to Scientific American.

South Dakota lawmakers are to weigh a bill aimed at teaching the strengths and weaknesses of scientific concepts, the Associated Press and KEVN-Black Hills Fox report.

In Science this week: the synthetic genetic system hachimoji, and more.

Thermo Fisher Scientific says it will no longer sell machines in China's Xinjiang region, according to the Wall Street Journal.