8795
A significant increase in spine density in cFos - expressing GnRH neurons was evident in control animals ; however , no significant increase was observed in the PNA - treated mice because spine density was elevated across all GnRH neurons .
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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:
 None