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Patients with the classical form ( type I ) and the more severely affected , connatal variant of Pelizaeus - Merzbacher disease ( type II ) would be predicted to display mutation at the PLP locus .
 Pelizaeus - Merzbacher disease ( type II )
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 ( type II )