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A similar potentiation of TNF effects was observed in Jurkat T cells and HeLa cells treated with soluble Tat protein .
 HeLa cells, TNF, Tat protein
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:
 HeLa cells, TNF, Tat protein