CXCR4 and muscular dystrophy: Being the third most common muscular dystrophy with an incidence of 12:100.000 (Deenen et al., 2014) after Duchenne muscular dystrophy and myotonic dystrophy, it will be very interesting to find out if the disruption of the CXCR4/SDF-1 axis as essential regulators of BA2-derived and non-somitic neck muscle development, is responsible for this illness.