We noticed that the levels of CD133+CXCR4+CD34- and CD133+CXCR4+CD34+ cells were quite stable over time in the controls, while in the DMD patients, the CD133+CXCR4+CD34- cells peaked at the age of 9 (Fig. 2A). This evidence concerns the gene CXCR4 and Duchenne muscular dystrophy.