Word: sheathed
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Dates: during 1980-1989
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...knows what causes multiple sclerosis, and there is no known cure for it. A degenerative disease of the central nervous system, MS destroys patches of myelin, the fatty tissue that forms a protective sheath around the nerve cells in the brain and spinal cord. This interferes with the flow of nerve impulses, much in the way that faulty insulation can cause electrical shortcircuits...