Stock Photo - NASA astronauts Clayton Anderson (left) and Rick Mastracchio, both STS-131 mission specialists, attired in their Extravehicular Mobility Unit (EMU) spacesuits; along with astronauts Dorothy Metcalf-Lindenburger (center), mission specialist; and Tracy Caldwell Dyson, Expedition 23 flight engineer, are pictured in the Quest airlock of the International Space Station prior to the start of the mission's third and final spacewalk.

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