867
Western blotting studies have indicated that the increase in the P450 enzymes could be due to the increase in the expression of P450 1A1 / 1A2 , 2B1 / 2B2 and 2E1 isoenzymes .
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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:
 None