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Astronauts’ blood shows signs of DNA mutations due to spaceflight

Astronaut cancer risk needs careful monitoring, concludes a study that stored spaceflyer blood for 20 years.

All fourteen astronauts in the study, from NASA’s space shuttle program, had DNA mutations in blood-forming stem cells, a Nature Communications Biology study (opens in new tab) Aug. 31 concluded. The mutations, though unusually high considering the astronauts’ age, was below a key threshold of concern, however.

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