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We compared U-937 cell adhesion and adhesion molecule expression in human umbilical venous ( HUVECs ) and arterial (HUAECs) endothelial cells exposed to tumor necrosis factor ( TNF ), interleukin-1 , and lipopolysaccharide ( LPS ).
 arterial (HUAECs) endothelial cells, adhesion molecule, human umbilical venous, tumor necrosis factor, HUVECs, interleukin-1, TNF, U-937 cell
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:
 arterial (HUAECs) endothelial cells, adhesion molecule, human umbilical venous, tumor necrosis factor, HUVECs, interleukin-1, TNF, U-937 cell