Kenji Otsuka1, Mikako Ito1, Bisei Ohkawara1, Akio Masuda1, Yu Kawakami1, Ko Sahashi2, Hiroshi Nishida3, Naoki Mabuchi4, Akemi Takano5, Andrew G. Engel6 & Kinji Ohno1 MuSK antibody-positive myasthenia gravis (MuSK-MG) accounts for 5 to 15% of autoimmune MG...