3357
To discriminate variants of Pelizaeus - Merzbacher disease , a set of oligonucleotide primers was constructed to polymerase - chain - reaction ( PCR ) amplify and sequence the gene encoding proteolipid protein ( PLP ) , a structural protein that comprises half of the protein of the myelin sheath .
 Disease: Pelizaeus - Merzbacher disease
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Disease 
Text: {0} 
 Entities: Pelizaeus - Merzbacher disease 
Answer:
 Disease: Pelizaeus - Merzbacher disease