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In this study, we investigate the role of TNFalpha -inducible reactive oxygen species (ROS) in IL-8 expression by "monocyte-like" U937 histiocytic lymphoma cells .
 IL-8, TNFalpha, U937 histiocytic lymphoma 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:
 IL-8, TNFalpha, U937 histiocytic lymphoma cells