23983
PB induced HO - 1 expression via the activation of Nrf2 in the hepatic cells , and ARE - dependent genes were stimulated via the PB - mediated Nrf2 activation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None