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These constructs were transfected into either HeLa cells , Jurkat cells or U937 cells in both the presence and absence of phorbol esters which have previously been demonstrated to activate HIV gene expression .
 cell line: HeLa cells; cell line: U937 cells; cell line: Jurkat cells
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 cell line: HeLa cells; cell line: U937 cells; cell line: Jurkat cells