This Week in PNAS

In this week's PNAS, Wayne State University researchers report on a way to monitor DNA synthesis at the single base-pair level. By looking at single-molecule Förster resonance energy transfer, researchers led by David Rueda were able to see the incorporation of three nucleotides by the Escherichia coli DNA polymerase I. They then noted that the FRET efficiency drops off and then returns the expected level.

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

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

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.