9497
Guided by the crystal structure of ExsD , we designed a monomeric variant of the protein , and demonstrated that ExsD trimerization prevents ExsD from inhibiting ExsA - dependent transcription at 30 degrees C .
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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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