On the contrary, all the measure of the expansion of CD201+ and PDGFRA+ non-myogenic mesenchymal cells did not correlate with the T1 score, accounting for different degrees of adipose tissue infiltration of each muscle globally evaluated by MRI in FSHD patients (Supplementary Fig. S3A–D). This evidence concerns the gene PROCR and facioscapulohumeral muscular dystrophy.