1817
Activation of the dPRL promoter construct in these undifferentiated cells could however be induced by the addition of cAMP , in the absence of progesterone , suggesting that a signal transduced through the cAMP signaling pathway is a primary inducer of decidual PRL gene expression .
 ( DNA: dPRL promoter, None) , ( DNA: PRL gene, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: dPRL promoter, None) , ( DNA: PRL gene, None) 