Both controls and DM1 cells express high levels of myogenic cell markers such as CD82, ITGB1 (CD29), MYF5, MYOD1, NCAM1 (CD56), and DES, as well as low levels of the fibroadipogenic (PDGFRa and CD34), endothelial (CD31 and TIE1), and myeloid (CD11B and CD45) cell markers (Supplementary Fig. 2e). This evidence concerns the gene PECAM1 and myotonic dystrophy type 1.