538
The alterations of 5 - HT and 5 - HIAA levels in several regions of the brain under the conditions examined may indicate that IDPN ' s neurotoxicity primarily affects 5 - HT - containing neurones .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None