6721
Our data showed that TNF resistance in vitro correlates with the increased level of transcription factor NF-kappaB .
 TNF, NF-kappaB, transcription factor
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:
 TNF, NF-kappaB, transcription factor