8254
The results of this study suggest that NF - kappaB activity may be regulated by its interaction with the cell cycle regulatory protein , E2F - 1 .
 NF - kappaB, E2F - 1
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 NF - kappaB, E2F - 1