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The kappa B enhancer of the gene encoding the interleukin-2 ( IL-2 ) receptor alpha chain ( IL-2R alpha ) is functional only in the hybrids expressing nuclear NF-kappa B .
 protein: nuclear NF-kappa B; protein: IL-2R alpha; protein: interleukin-2 ( IL-2 ) receptor alpha chain; protein: NF-kappa B; cell line: hybrids; protein: IL-2; protein: interleukin-2; DNA: kappa B enhancer
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: nuclear NF-kappa B; protein: IL-2R alpha; protein: interleukin-2 ( IL-2 ) receptor alpha chain; protein: NF-kappa B; cell line: hybrids; protein: IL-2; protein: interleukin-2; DNA: kappa B enhancer