1700
By using transient transfection assays , we found that cross-linking CD40 supports NF-kappa B -dependent gene expression .
 NF-kappa B, CD40
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-kappa B, CD40