3841
Mutations of the CRE site that result in loss of CREB binding also lead to loss of functional activity of the bcl-2 promoter in transient-transfection assays.
 CREB, CRE site
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, CRE site