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Recently we demonstrated the ability of mercuric chloride ( Hg ( 2 + ) ) in human hepatoma HepG2 cells to significantly decrease the TCDD - mediated induction of Cytochrome P450 1A1 ( CYP1A1 ) mRNA , protein , and catalytic activity levels .
 Chemical: mercuric chloride; Chemical: Hg ( 2 + ); 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: mercuric chloride; Chemical: Hg ( 2 + ); Chemical: TCDD