7087
Taken together our results suggest that TM4 and ECL2 undergo conformational changes during CXCR4 activation and also demonstrate how TM4 is an important feature for the binding of anti - HIV compounds .
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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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