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Our results showed that MeHg did not alter the TCDD - mediated induction of CYP1A1 mRNA , or protein levels ; however it was able to significantly decrease CYP1A1 catalytic activity levels in a concentration - dependent manner .
 Chemical: MeHg; 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: MeHg; Chemical: TCDD