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The effects of human immunodeficiency virus 1 ( HIV-1 ) infection on cellular differentiation and NF-kappa B DNA binding activity have been investigated in a new model of myeloid differentiation.
 protein: NF-kappa B
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