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In the present study , we generated transgenic mice in which enhanced green fluorescence protein was expressed under the control of a fetal Leydig cell - specific enhancer of the Ad4BP / SF - 1 ( Nr5a1 ) gene .
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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:
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