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To clarify the regulatory molecular mechanisms behind cell cycle aberrations related to the early stages of hepatocarcinogenesis , we performed gene expression analysis using microarrays and real - time reverse transcription polymerase chain reaction followed by immunohistochemical analysis in the livers of rats treated with the cytomegaly inducing hepatocarcinogens thioacetamide ( TAA ) , fenbendazole , and methyleugenol , the cytomegaly non - inducing hepatocarcinogen piperonyl butoxide ( PBO ) , or the non - carcinogenic hepatotoxicants acetaminophen and alpha - naphthyl isothiocyanate , for 28 days .
 Chemical: thioacetamide; Chemical: TAA; Chemical: fenbendazole; Chemical: methyleugenol; Chemical: piperonyl butoxide; Chemical: PBO; Chemical: acetaminophen; Chemical: alpha - naphthyl isothiocyanate
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: thioacetamide; Chemical: TAA; Chemical: fenbendazole; Chemical: methyleugenol; Chemical: piperonyl butoxide; Chemical: PBO; Chemical: acetaminophen; Chemical: alpha - naphthyl isothiocyanate