7555
We first found that NAC inhibited the constitutive as well as the LPS -induced activity of the transcription factor NF-kappaB .
 transcription factor, NF-kappaB
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:
 transcription factor, NF-kappaB