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One of the cellular targets of the trans-activating effects of Tax is the NF-kappa B /Rel family of transcription factors , pleiotropic regulators of immunoregulatory , cytokine and viral gene expression .
 transcription factors, NF-kappa B, NF-kappa B /Rel family, pleiotropic regulators
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:
 transcription factors, NF-kappa B, NF-kappa B /Rel family, pleiotropic regulators