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Year in space put US astronaut's disease defenses on alert
Data raises new questions about possible Mars expedition
space twins.jpg
In this March 26, 2015 file photo, U.S. astronaut Scott Kelly, right, crew member of the mission to the International Space Station, stands behind glass in a quarantine room, behind his brother, Mark Kelly, also an astronaut, after a news conference in the Russian-leased Baikonur, Kazakhstan cosmodrome. Nearly a year in space put Scott Kelly's immune system on high alert and changed the activity of some of his genes compared to his Earth-bound identical twin, according to a report. - photo by Associated Press
WASHINGTON — Nearly a year in space put astronaut Scott Kelly's immune system on high alert and changed the activity of some of his genes compared to his Earth-bound identical twin, researchers said Friday.
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