Astronauts' blood can show signs of DNA mutations after spaceflight and therefore their cancer risk should be monitored, a new study reveals. Fourteen astronauts from 's space shuttle program who flew between 1998 and 2001 on shuttle missions averaging 12 days took part in the study: 85 percent were male and six were on their first mission for the space agency. Researchers collected whole blood samples from the astronauts twice - ten days before spaceflight and on the day of landing - as well as white blood cells that were collected just once, three days after landing. Those sample were put into a freezer at minus 112 degree Fahrenheit and not touched for 20 years.
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