Using sequencing, researchers at the Walter Reed Army Institute of Research are searching for bacteria that harbor the mcr-1 gene, which bestows resistance to colistin, an antibiotic of last-resort, NBC News reports. And in mid-May, they uncovered a strain of E. coli obtained from a Pennsylvania woman with a urinary tract infection that had the mcr-1 gene.

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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.