12543
Since the co-expression with a dominant negative c-Fos abolished the responsiveness to TPA , we conclude that activated transcription of the DRA gene depends on interactions between the X2 box and NF-X2 , which contains c-Fos .
 c-Fos, DRA gene, c-Fos, X2 box, NF-X2
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:
 c-Fos, DRA gene, c-Fos, X2 box, NF-X2