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The results indicate that long - term intake of NaAsO2 causes oxidative damage in the rat liver , and Na2SeO3 protects liver cells by adjusting the expression of oxidative stress related genes to improve the activities of antioxidant enzymes .
 Chemical: NaAsO2; Chemical: Na2SeO3
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: NaAsO2; Chemical: Na2SeO3