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Pelizaeus - Merzbacher disease : detection of mutations Thr181 - - - - Pro and Leu223 - - - - Pro in the proteolipid protein gene , 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