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In this study , we investigated the mechanism by which Tax activates gene expression in conjunction with members of the ATF / CREB family .
 GENE: Tax; GENE: ATF; GENE: CREB
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: Tax; GENE: ATF; GENE: CREB