13290
HO - 1 expression is triggered by the Nrf2 - Keap1 signalling pathway , initiated by the addition of chalcones to thiol groups of Keap1 via Michael - type reaction .
 chalcones, thiol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 chalcones, thiol