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Proteolipoprotein gene analysis in 82 patients with sporadic Pelizaeus - Merzbacher Disease : duplications , the major cause of the disease , originate more frequently in male germ cells , but point mutations do not .
 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