CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY CAROL & MIKE WERNER / VISUALS UNLIMITED, INC. / SCIENCE PHOTO LIBRARY
Dystrophin. Muscular dystrophy is believed to be caused by a defective dystrophin gene. When defective, this gene fails to make dystrophin (shown lower right), a protein essential for maintaining muscle.
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