21010
Comparing the model - predicted DRTC with experimental data provided insight into how the feedback control mechanisms in the HPG axis mediate these changes : specifically , adaptive changes in plasma E2 levels occurring during exposure and " overshoot " occurring postexposure .
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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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