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A family with an apparent history of X - linked Pelizaeus - Merzbacher disease presented for genetic counseling , requesting carrier detection and prenatal diagnosis .
 Pelizaeus - Merzbacher disease
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