NCAM1 and Duchenne muscular dystrophy: To identify the myogenic potential of human muscle stem origin in vivo, tibialis anterior muscle sections from DMD mice injected with either CD56+ or CD56− cells which were grown from primary bulk population of extra eyelids in the condition of 20% oxygen for 7 days, or immortalized human myoblasts Hu5 cells as a positive transplantation control (Figure 5a) were used.