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We propose that KBF1 is a competitive inhibitor of NF-kappa B and discuss how these factors may be involved in the transient expression of IL-2 and IL-2 alpha genes during the immune response .
 protein: KBF1; protein: IL-2; protein: NF-kappa B; protein: IL-2 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:
 protein: KBF1; protein: IL-2; protein: NF-kappa B; protein: IL-2 alpha