9782
We suggest that FlgN and FliT are substrate - specific flagellar chaperones that prevent oligomerization of the HAPs by binding to their helical domains before export .
 FlgN, FliT, HAPs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 FlgN, FliT, HAPs