7890
By using PD98059 , we demonstrated that the Raf1/MEK1/ ERK1/2 pathway did not affect the DNA binding of NF-kappa B but, rather, acted at the level of transcriptional activity of NF-kappa B .
 NF-kappa B, ERK1/2, NF-kappa B
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, ERK1/2, NF-kappa B