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Bax and Bax / Bcl - 2 expressions in the fluoride group and Bax mRNA expression in the high selenium group were highly elevated ( 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