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What are the symptoms of Becker's muscular dystrophy?

Duchenne and Becker muscular dystrophy are names for the same disorder caused by genetic mutations in the DMD gene.  The DMD gene makes a protein called dystrophin.  LONG ANSWER: Duchenne and Becker muscular dystrophy are names for the same disorder caused by genetic mutations in the DMD gene.  The DMD gene makes a protein called dystrophin.  It is located on the X chromosome, which means that boys inherit the mutation from their mothers. This leads to symptoms such as muscle weakness and difficulty with walking or running, which are apparent by age 5 in Duchenne or later in Becker.

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