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To learn about causative mechanisms , we have cloned and sequenced the breakpoints of a cytologically balanced constitutional reciprocal translocation , t ( X ; 4 ) ( p21 . 2 ; q31 . 22 ) , present in a girl with Duchenne muscular dystrophy ( DMD ) .
 Duchenne muscular dystrophy, DMD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Duchenne muscular dystrophy, DMD