4734
X - linked spastic paraplegia and Pelizaeus - Merzbacher disease are allelic disorders at the proteolipid protein locus .
 X - linked spastic paraplegia, Pelizaeus - Merzbacher disease, allelic disorders
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 X - linked spastic paraplegia, Pelizaeus - Merzbacher disease, allelic disorders