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Furthermore , the Ao mRNA levels did not change in any of the extrahepatic tissues studied on day 6 , nor did its hepatic levels at days 1 , 3 , 5 , or 7 after PAN injection .
 Chemical: PAN
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: PAN