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In the present study , we investigated the regulation of connexin43 ( Cx43 ) and Cx43 - mediated gap junctional intercellular communication ( GJIC ) during the AhR - dependent disruption of contact inhibition in non - tumorigenic liver epithelial cells .
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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:
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