We found that miR-9 is able to prevent the formation of the large aggregates seen in MG from the Dicer-CKOMG mice in vitro; miR-9-transfected Dicer-CKOMG MG acquired an appearance more like the wild-type MG (Fig. 6j–l) and their aggregation was reduced to that of the wild-type MG (Fig. 6m; Supplementary Data 1). This evidence concerns the gene MGAM and myasthenia gravis.