6911
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 .
 vascular cell adhesion molecule 1, intercellular adhesion molecule 1, U937, activated EC, monocytic cell line, E-selectin
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 vascular cell adhesion molecule 1, intercellular adhesion molecule 1, U937, activated EC, monocytic cell line, E-selectin