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Without myelin, the protective sheath that insulates nerve fibers, nerve signal transmission becomes significantly slower and less efficient. This can lead to various neurological issues, including muscle weakness, coordination problems, and sensory disturbances. Conditions such as multiple sclerosis are characterized by the deterioration or absence of myelin, resulting in disrupted communication between the brain and the rest of the body. Ultimately, the lack of myelin can severely impact overall nervous system function.

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