The muscular: dystrophies (MD) are a group of > 30 genetic diseases that cause progressive weakness and degeneration of muscles. Age of onset, distribution & extent of skeletal muscle weakness, rate of progression, cardiac & smooth muscle involvement & pattern of inheritance differ. Duchenne MD affects 1:3500- 1:6000 male births/year in the US. See http://www.ninds.nih.gov/disorders/md/detail_md & mda.org.
Answered 1/28/2015
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