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In this study, we characterized C. pneumoniae-mediated activation of endothelial cells and demonstrated an enhanced expression of endothelial adhesion molecules followed by subsequent rolling, adhesion, and transmigration of leukocytes ( monocytes , granulocytes ).
 monocytes, endothelial adhesion molecules, endothelial cells, granulocytes, leukocytes
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:
 monocytes, endothelial adhesion molecules, endothelial cells, granulocytes, leukocytes