MULTIPLE SCLEROSIS: a demyelinating* disease marked by patches of hardened tissue in the brain or the spinal cord and associated especially with partial or complete paralysis and jerking muscle tremor.
* Demyelinating: causing or characterized by the loss or destruction of myelin demyelinating diseases. Myelin: a soft white somewhat fatty material that forms a thick myelin sheath about the protoplasmic core of a myelinated nerve fiber. Myelic: of or relating to the spinal cord . Myelin sheath: a layer of myelin surrounding some nerve fibers called also medullary sheath Myelin basic protein: a protein that is a constituent of myelin, that causes experimental allergic encephalomyelitis when injected into laboratory animals, and that probably acts as an autoantigen in individuals affected with multiple sclerosis abbreviation MBP.
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