5606
Evaluation of the p17 antagonist activity of a panel of biotechnological heparins derived by chemical sulfation of the Escherichia coli K5 polysaccharide revealed that the highly N , O - sulfated derivative prevents the binding of p17 to both heparin and CXCR1 , thus inhibiting p17 - driven chemotactic migration of human monocytes with an efficiency that is higher than those of heparin and HS .
 Chemical: N; Chemical: O
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: N; Chemical: O