The origins of shelter dogs can be obscure, and Gemma Tarlach at Discover writes that her three dogs are no different. One looks like an American Bulldog and another like a Labrador, while her third acts like a hound, with a predilection for treeing squirrels and baying, though all have pit bull-like characteristics.

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Chinese state news agency Xinhua reports that a preliminary investigation has found He Jiankui performed his gene-editing work illegally.

John Mendelsohn, a former president of the University of Texas MD Anderson Cancer Center, has died, the New York Times reports.

Identical twins receive different estimates of ancestry from the same direct-to-consumer genetic testing firms, CBC reports.

In PNAS this week: chromosomal features of maize, adaptations in the vinous-throated parrotbill, and more.