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This level of NF-kappa B -independent activity appears to be sufficient for virus multiplication , since TNF-alpha treatment had no effect on the kinetics of de novo HIV type 1 ( HIV-1 ) infection and viral RNA production in U937 cells .
 cell line: U937 cells; protein: NF-kappa B; RNA: viral RNA; protein: TNF-alpha
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: U937 cells; protein: NF-kappa B; RNA: viral RNA; protein: TNF-alpha