12258
Mutations in the gene coding for a tumour suppressor merlin cause development of multiple tumours of the nervous system such as schwannomas , meningiomas and ependymomas occurring spontaneously or as part of a hereditary disease neurofibromatosis type 2 .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None