Mutations in the dystrophin gene lead to the occurrence of DMD (Monaco et al., 1986) (Hoffman et al., 1987b) (Hoffman et al., 1987a) (Bonilla et al., 1988) (Haidet et al., 2008) (Okubo et al., 2020) and the severity of DMD strongly depends on the mutation type. The gene discussed is DMD; the disease is Duchenne muscular dystrophy.