5599
By exploiting an approach integrating computational modeling , site - directed mutagenesis of p17 , chemical desulfation of heparin , and surface plasmon resonance , we characterized the interaction of p17 with heparin , a HSPG structural analog , and CXCR1 .
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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:
 None