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Induction of new CREB complexes implies a physiological role for cAMP in mitogen activation of T lymphocytes .
 CREB complexes, mitogen, CREB, T lymphocytes
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:
 CREB complexes, mitogen, CREB, T lymphocytes