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STS-90 Payload Specialist James Pawelczyk, Ph.D., stands behind his two children, Bradley and Katlyn (left to right), as they smile to photographers near Launch Pad 39B. James and the rest of the seven-member crew are scheduled to launch aboard Columbia, seen in the background, on May 16 at 2:19 p.m. EDT. The astronauts are under strict health stabilization guidelines to protect them from close contact with persons who do not have health stabilization clearance. This is the 25th flight of Columbia and the 90th mission flown since the start of the Space Shuttle program. This launch of Neurolab will examine the effects of spaceflight on the brain, spinal cord, peripheral nerves and sensory organs in the human body.