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This alternative pathway of Tat activation is mediated by the viral enhancer , a kappa B domain capable of binding the prototypical form of the transcription factor nuclear factor kappa B ( NF-kappa B ) present in many cell types, including T lymphocytes .
 Tat, NF-kappa B, transcription factor, viral enhancer, T lymphocytes
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:
 Tat, NF-kappa B, transcription factor, viral enhancer, T lymphocytes