14695
Through a series of biophysical characterizations of inhibitor - protein interactions ( NMR and X - ray crystallography ) , we have established the structural requirements for artificial inhibitors of the HIF - 2 alpha - ARNT PAS - B interaction .
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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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