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A C - - greater than G transversion has been found in exon 3 of the PLP gene of affected males and their mother in a single sibship with Pelizaeus - merzbacher disease ( PMD ) .
 Pelizaeus - merzbacher disease, PMD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 Pelizaeus - merzbacher disease, PMD