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Both proteins impart cAMP -regulated transcriptional activity to a heterologous DNA-binding domain , showing that cAMP directly modulates the transcriptional stimulatory activity of CREB .
 protein: CREB; DNA: heterologous DNA-binding domain
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: CREB; DNA: heterologous DNA-binding domain