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The nuclear factor kappaB ( NF-kappaB ) is thought to be crucially involved in the gene activation of several cytokines , including tumor necrosis factor alpha ( TNF ).
 nuclear factor kappaB, cytokines, NF-kappaB, TNF, tumor necrosis factor alpha
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:
 nuclear factor kappaB, cytokines, NF-kappaB, TNF, tumor necrosis factor alpha