8410
We hypothesized that activation of the protein kinase A signaling pathway may inhibit NF-kappaB -mediated transcription by phosphorylating proteins, such as cAMP response element-binding protein ( CREB ), which compete for limiting amounts of the coactivator CBP .
 protein kinase A, NF-kappaB, cAMP response element-binding protein, CBP, CREB
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:
 protein kinase A, NF-kappaB, cAMP response element-binding protein, CBP, CREB