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Becker muscular dystrophy (BMD), a dystrophinopathy with milder skeletal muscle manifestations compared to Duchenne muscular dystrophy, characteristically demonstrates weakness of knee extensors (KE), accompanied by muscle atrophy and fibrosis. The weakness predisposes to gait impairment and loss of ambulation. Myostatin, a member of the TGF-β superfamily of signal peptides, is expressed in skeletal...