A 46-yeаr-оld mаn stаrts tо nоtice that his eyelids are drooping. Some time afterwards, his jaw becomes weak. He has difficulty swallowing and weakness in his limbs as well. He is quite embarrassed when he eats, because he must use his hand to help support his jaw. His weakness gets progressively worse. Finally, he sees his family doctor with his complaints. His physical examination demonstrates the weakness in his limbs; however, no sensory defects are present. What is the underlying pathology of this disease?
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