MYH6 and Duchenne muscular dystrophy: Whereas developmental myosins precede the appearance of adult fast myosins in the developing skeletal muscle and disappear in most skeletal muscles during early postnatal development (50,51), regenerating muscle fibers in DMD re-express developmental isoforms of myosin as MyHC-emb (52), offering a useful marker of regenerative processes in dystrophic muscles.