RecruitingMuSK Myasthenia 1000 StudyThe MuSK myasthenia gravis 1000 study seeks to collect saliva samples from 1000 subjects with laboratory confirmed diagnosis of MuSK myasthenia to identify genetic variations associated with MuSK MG. The data collected may be used by researchers to gain a better understanding of the cause of MuSK MG and to identify biomarkers and targeted therapy for MuSK MG.