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Here , we examine the mechanism regulating the expression of the Drosophila EDG84A gene , a target gene of the orphan nuclear receptor beta FTZ - F1 , as a model to study the cooperative behavior among nuclear receptors .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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