28529
At the early life stage , the fertilized eggs of medaka were exposed to 1 , 10 , 100 and 1000ng / L EV for 15 days , and hatched larval fish were continually exposed to the same concentration range for an additional 15 days .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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