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PDTC , apocynin , or SKF525a decreased adhesion of monocytic U937 cells to TNF-treated HUVECs (by 75% at 100 mumol/L PDTC ).
 TNF-treated HUVECs, HUVECs, monocytic U937 cells
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:
 TNF-treated HUVECs, HUVECs, monocytic U937 cells