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Among myasthenia gravis patients who are seronegative (SNMG) for acetylcholine receptor antibodies (AchR Ab), up to 70% demonstrate positivity for IgG antimuscle-specific kinase (MuSK) antibodies. How do they differ clinically from SNMG patients negative for both AchR Ab and MuSK Ab?

Clinical Features of MuSK-Positive Myasthenia Gravis