Clinical Research Directory

Inclusion Criteria: * Subjects with DMD or BMD based on genetic testing. Control subjects are unknown to have any other muscular dystrophy by history and may have had no genetic testing. * Able to provide informed consent or assent for participation in the study. * Demographic characteristics for biofluid collection: Males age 5 years and older with DMD or BMD; males and females ages 18 years and older without muscular dystrophy. Exclusion Criteria: * Medical history of any of the following: State of immunosuppression; coagulopathy; pre-existing liver or kidney disease; documented HIV positive; documented hepatitis B and/or C positive. * Use of anti-platelet drugs within 7 days prior to blood draw; use of anticoagulants within 60 days prior to blood draw. * Inability or unwillingness of the subject to give written informed consent.