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Nuclear factor kappa B ( NF-kappa B ) is a pleiotropic transcription factor which is involved in the transcriptional regulation of several specific genes.
 NF-kappa B, pleiotropic transcription factor, Nuclear factor kappa B
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 NF-kappa B, pleiotropic transcription factor, Nuclear factor kappa B