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Jay C. Buckey, Jr., STS-90 payload specialist, prepares to initiate a test of the equipment during crew training. In the Spacelab, the Neurolab crew will use a sophisticated lung function system that tests how the brain controls the concentrations of carbon dioxide and oxygen in the blood. Crew members will breathe into a mouthpiece, and premeasured gas test mixtures will be delivered to them as part of the test protocol.