MUSK and myasthenia gravis: It has been shown that serum miR-151a, let-7a, let-7f, and miR-423, plasma miR-210 and miR-324, as well as PBMC miR-340, miR-106b, and miR-27a are upregulated in MuSK+ MG patients (Punga et al., 2016; Tan et al., 2021).