BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Multiple sclerosis. Light micrograph of a section through white matter of the nervous system showing a large area of demyelinated nerve fibres (white). 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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