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Posttranslational mechanisms modulating the expression of the cytochrome P450 1A1 gene by methylmercury in HepG2 cells : A role of heme oxygenase - 1 .
 Chemical: methylmercury; Chemical: heme
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: methylmercury; Chemical: heme