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Finally, transfection of CREB protein and protein kinase A expression vectors were found to activate Zp in Jurkat cells , suggesting that phosphorylated form of CREB protein can play a determining role in the EBV reactivation process .
 Zp, CREB protein, protein kinase A expression vectors, Jurkat cells, CREB protein
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:
 Zp, CREB protein, protein kinase A expression vectors, Jurkat cells, CREB protein