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KENNEDY SPACE CENTER, Fla. -- The Space Shuttle Orbiter Columbia begins its rollout from the Vehicle Assembly Building to Launch Pad 39A in preparation for the STS-83 mission. The Microgravity Science Laboratory-1 (MSL-1) Spacelab module is the primary payload on this 16-day spaceflight. The MSL-1 will be used to test some of the hardware, facilities and procedures that are planned for use on the International Space Station, while the seven-member flight crew conducts combustion, protein crystal growth and materials processing experiments