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The molecular mechanisms underlying the sustained nuclear translocation of NF-kappa B observed in U937 monocytic cells chronically infected with human immunodeficiency virus ( HIV ) were studied.
 protein: NF-kappa B; cell line: U937 monocytic cells; cell type: monocytic 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:
 protein: NF-kappa B; cell line: U937 monocytic cells; cell type: monocytic cells