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The optimal dose of Na2SeO3 to protect against fluoride - induced renal cell apoptosis was determined to be 1 . 5 mg / L .
 Chemical: Na2SeO3; Chemical: fluoride
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: Na2SeO3; Chemical: fluoride