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Exposure concentrations were selected and anchored to the positive control , 17 beta - estradiol ( E2 ) , based on previously determined behavioral or teratogenic phenotypes .
 Chemical: 17 beta - estradiol
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: 17 beta - estradiol