23437
Immunoprecipitation - immunoblot and chromatin immunoprecipitation analyses suggest that CAR binds to the PB - responsive enhancer module with HIF - 1 alpha in the liver of untreated mice and that the complex dissociates upon PB treatment .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None