25106
Substantial neuronal apoptosis was documented in the CA3 hippocampus cells after DBI ( 22 . 26 +/- 2 . 97 % at 72 h after DBI vs . 2 . 92 +/- 0 . 88 % in sham - operated animals ) .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 None