9902
Helenalin , an anti-inflammatory sesquiterpene lactone from Arnica , selectively inhibits transcription factor NF-kappaB [see comments]
 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:
 NF-kappaB, transcription factor