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FILE - 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 released on Friday, Feb. 15, 2019. (AP Photo/Dmitry Lovetsky)

FILE - 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 released on Friday, Feb. 15, 2019. (AP Photo/Dmitry Lovetsky)

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