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AhR - and ARNT - dependent regulation of selected target genes of interest was then confirmed using TCDD as a model AhR agonist , together with pharmacological inhibition of the AhR and by RNA - interference techniques .
 Chemical: TCDD
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: TCDD