Stock Photo - NASA astronauts James P. Dutton Jr. (left), STS-131 pilot; Rick Mastracchio and Clay Anderson, both mission specialists; along with Russian cosmonaut Oleg Kotov, Expedition 22 flight engineer and Expedition 23 commander, participate in a training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Stock Photo: NASA astronauts James P. Dutton Jr. (left), STS-131 pilot; Rick Mastracchio and Clay Anderson, both mission specialists; along with Russian cosmonaut Oleg Kotov.

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