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Multiple sclerosis (MS). (a) A disease characterized by the gradual development of small areas of ha

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Multiple sclerosis (MS). (a) A disease characterized by the gradual development of small areas of hardened (sclerotic) tissue in the cerebrum, it results in a gradual loss of brain function. The inset compares a normal neuron with a damaged neuron in the brain. (b) MRI of the brain showing MS lesions in blue.  Courtesy of Dr. Leon Kaufman, University of California, San Francisco, and the National Cancer Institute, National Institutes of Health.
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