3964
Among the tested CYP isoforms ( 1A1 , 1A2 , 1B1 , 2B1 , 2C11 , 2E1 , 3A1 , 3A2 , and 4A1 ) , CYP1B1 and 4A1 were increased by GGT extracts .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None