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"Oh, I'm sorry. Tyrosine kinase. Sometimes referred to as musk. Musk. This protein helps form the nerve muscle junction. Antibodies against this protein can lead to myasthenia gravis. Antibodies against another protein called lipoprotein related protein 4, LRP4, say that 20 times fast can play a part in this condition. Research studies have found other antibodies and the number of antibodies involved will likely grow over time. Some people have myasthenia gravis that isn't caused by antibodies blocking acetylcholine, Musk, or LRP4."