CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
Multiple sclerosis. Light micrograph of a section through the brain showing a large area of demyelinated nerve fibres (light pink, top) due to multiple sclerosis. Multiple sclerosis is an autoimmune condition, in which the immune system attacks the myelin sheath that insulates nerve cells, impairing their ability to relay signals efficiently.
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