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Stacie Greene, an extravehicular activity trainer from Johnson Space Center, discusses the STS-90 Neurolab mission with Mission Specialist Richard Linnehan overlooking Columbia's payload bay. The crew of STS-90 participated in the Crew Equipment Interface Test (CEIT) in Kennedy Space Center's Orbiter Processing Facility Bay 3. The CEIT gives astronauts an opportunity to get a hands-on look at the payloads with which they will be working on-orbit. Investigations during the STS-90 Neurolab mission will focus on the effects of microgravity on the nervous system. Specifically, experiments will study the adaptation of the vestibular system, the central nervous system, and the pathways that control the ability to sense location in the absence of gravity, as well as the effect of microgravity on a developing nervous system. STS-90 is scheduled for launch on April 16 at 2:19 p.m. EDT.