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In this study we investigated the effect of methylmercury ( MeHg ) on CYP1A1 in HepG2 cells .
 Chemical: methylmercury; Chemical: MeHg
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: MeHg