4440
In PB mice , there was only a small deficit in the number of the hippocampal pyramidal neurons compared to controls ( 15 % , p less than 0 . 01 ) , and no deficit in the granule cells .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None