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Our data also suggest that whilst NF-kappa B may be an essential component of LMP1 signal transduction , other cell-specific factors may be required to effect some functions of the viral protein .
 NF-kappa B, LMP1, viral protein, cell-specific 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, LMP1, viral protein, cell-specific factors