4499
A pair of female monozygotic ( MZ ) twins , heterozygous carriers for a deletion in the DMD gene and discordant for the clinical manifestations of Duchenne muscular dystrophy , were analyzed by molecular studies , in situ hybridization , and methylation pattern of X chromosomes to search for opposite X inactivation as an explanation of their clinical discordance .
 DMD, Duchenne muscular dystrophy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 DMD, Duchenne muscular dystrophy