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…showed last 75 words of 228 total…reach the muscle cells which is caused by blockage of the action of neurotransmitters. Acetylcholine Receptors on the muscles are actually destroyed by the immune system, thus it is an immune response of the body against itself. High levels of antibodies block the action of neurotransmitters. The cause of autoimmune disorders such as MG is unknown. In some cases it may be associated with tumors of the thymus. MG affects an estimated 3 out of 10,000 people.