27508
The results showed that Bcl - 2 , Bax , and Bax / Bcl - 2 protein expressions in the fluoride and high selenium groups were highly elevated compared with the control group ( P < 0 . 01 ) .
 Chemical: fluoride; Chemical: selenium
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: fluoride; Chemical: selenium