DMD and Duchenne muscular dystrophy: 2012). This system allows for sequence‐specific cleavage of target loci across the genome and has been successful in correcting the dystrophin mutation in the germ line of mdx mice (Long et al. 2014), in DMD patient myoblasts (Ousterout et al. 2015) and in induced Pluripotent Stem cells (iPS) (Li et al. 2015).