8791
To assess E2 - positive feedback , control and PNA - treated GnRH - green fluorescent protein transgenic mice were subjected to a standard ovariectomy with E2 - replacement regimen , and both plasma and perfusion - fixed brains were collected at the time of the expected GnRH / LH surge .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None