426
However, other transcription factors or coactivators of NF-kappa B are required for tax activation but these remain to be identified.
 NF-kappa B, tax, transcription factors
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, tax, transcription factors