- Written informed consent.
- Confirmed clinical and molecular diagnosis of Becker Muscular Dystrophy (BMD),
Facioscapulohumeral Muscular Dystrophy (FSHD), or Limb-Girdle Muscular Dystrophy
- Independently ambulatory
- Patients with certain clinical conditions
- Patients using steroids or other medications with the potential to affect muscle
- History of sensitivity to monoclonal antibodies or protein pharmaceuticals
- Pregnant or lactating women.