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Killifish chronically exposed ( 15 days ) to 100ng / L EE2 displayed no difference in EE2 uptake rate or tissue - specific distribution .
 Chemical: EE2; Chemical: EE2
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: EE2; Chemical: EE2