This discovery has been possible thanks to elucidating the nature of DMD gene mutations in Becker muscular dystrophy (BMD), the milder and much rarer form of the dystrophin-dependent disease, in which the mutations result in loss of some exons, but do not abolish the dystrophin expression, as is the case in DMD [44]. The gene discussed is DMD; the disease is Becker muscular dystrophy.