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We suggest that PLP has a vital function in glial cell development , distinct from its later role in myelin assembly , and that this dichotomy of action may explain the clinical spectrum of Pelizaeus - Merzbacher disease . .
 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