3408
Since it is known that PGE2 is able to increase cAMP levels , we investigated whether it can affect gene expression through the activation of the transcription factors which bind enhancer elements in the promoter regions of cAMP -regulated genes .
 protein: transcription factors; DNA: cAMP -regulated genes
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: transcription factors, cAMP -regulated genes 
Answer:
 protein: transcription factors; DNA: cAMP -regulated genes