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We demonstrate that amounts of transcriptionally active phosphorylated CREB protein ( P-CREB ) differ between activated PBMC and Jurkat cells .
 PBMC, P-CREB, phosphorylated CREB protein, Jurkat cells
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:
 PBMC, P-CREB, phosphorylated CREB protein, Jurkat cells