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In this work we studied both the functional effect of NSAIDs on the neutrophils / endothelial cells dynamic interaction , and the potential involvement of reactive oxygen species ( ROS ) in the NSAIDs - mediated down - regulation of L - selectin .
 Chemical: oxygen
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: oxygen