11660
Activation of the transcription factor NF-kappaB in lipopolysaccharide -stimulated U937 cells .
 NF-kappaB, lipopolysaccharide -stimulated U937 cells, 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:
 NF-kappaB, lipopolysaccharide -stimulated U937 cells, transcription factor