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We concluded that this assay is capable of distinguishing ER alpha agonists and antagonists and that it even reflects the structural similarity of ER alpha agonists , indicating a potential to achieve identification and classification of ER alpha endocrine disruptors with high fidelity .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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