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When U937 cells were infected with HIV-1 , no induction of NF-KB factor was detected, whereas high level of progeny virions was produced, suggesting that this factor was not required for viral replication .
 cell line: U937 cells; protein: NF-KB factor; protein: NF-KB
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-KB factor; protein: NF-KB