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The activated EC were examined for the adherence of a monocytic cell line ( U937 ), as well as for expression of vascular cell adhesion molecule 1 , intercellular adhesion molecule 1 , and E-selectin .
 ( protein: vascular cell adhesion molecule 1, None) , ( protein: intercellular adhesion molecule 1, None) , ( cell line: U937, None) , ( cell line: activated EC, None) , ( cell line: monocytic cell line, None) , ( protein: E-selectin, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: vascular cell adhesion molecule 1, None) , ( protein: intercellular adhesion molecule 1, None) , ( cell line: U937, None) , ( cell line: activated EC, None) , ( cell line: monocytic cell line, None) , ( protein: E-selectin, None) 