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Myasthenia gravis (autoimmune disease of the nerves, muscles)

An autoimmune disorder characterized by progressive fatigue and muscle weakness. Muscle strength may be normal at the beginning of a task such as talking; then it becomes progressively weaker as the activity continues. Antibodies block, alter, or destroy the receptors for acetylcholine at the neuromuscular junction, preventing normal muscle contraction. It is more common in young females. It is sometimes associated with a tumor of the thymus (thymoma).
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