27512
Compared with the fluoride group , the group treated with low selenium has Bax protein expression that was observably reduced ( P < 0 . 05 ) ; the group treated with moderate selenium has Bcl - 2 protein expression that was observably elevated ( P < 0 . 05 ) , Bax protein expression that was highly reduced ( P < 0 . 01 ) , and Bax / Bcl - 2 protein expression that was observably reduced ( P < 0 . 05 ) ; the group treated with high selenium has Bcl - 2 protein expression that was highly elevated ( P < 0 . 01 ) , Bax protein expression that was highly elevated ( P < 0 . 01 ) , and Bax / Bcl - 2 protein expression that was highly reduced ( P < 0 . 01 ) ; the groups treated with moderate selenium and high selenium have Bax mRNA expression that was highly reduced ( P < 0 . 01 ) , and the groups treated with high selenium have Bax / Bcl - 2 mRNA expression that was observably reduced ( P < 0 . 05 ) .
 Chemical: fluoride; Chemical: selenium; Chemical: selenium; Chemical: selenium; Chemical: selenium; Chemical: selenium; 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; Chemical: selenium; Chemical: selenium; Chemical: selenium; Chemical: selenium; Chemical: selenium