Myasthenia Gravis is an auto-immune disease which causes severe muscle weakness. It is a disorder of the junction between the nerve and the muscle, caused by the body's immune system attacking a vital part of this junction - this impairs the ability of the nerve to cause muscle contraction, and hence produces the apparent weakness. The cause of this auto-immune reaction is not yet known (Myasthenia Gravis Association, 2014; https://www.mga-charity.org/information-mg/myasthenia-gravis, January 2014).
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