CD63 and Duchenne muscular dystrophy: Levels of three miRNAs (miR-1, miR-133a, and miR-206 levels) and of two miRNAs (miR-1 and miR-133a) were found to be significantly enriched in CD63- and MHC II-associated EVs, respectively, in the serum of DMD patients compared with that of healthy controls (Fig 1C–1E).