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We focused our studies on the role of Pit-1 and of PR as potential transcriptional regulators , since the POU domain protein Pit-1 is essential in the control of pituitary PRL expression , and progesterone induces decidual transformation of the endometrial stroma , a differentiation process during which the decidual PRL gene is activated.
 ( DNA: PRL gene, None) , ( protein: transcriptional regulators, None) , ( protein: PR, None) , ( protein: Pit-1, None) , ( protein: POU domain protein, None) , ( DNA: Pit-1, None) , ( protein: PRL, 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: PRL gene, None) , ( protein: transcriptional regulators, None) , ( protein: PR, None) , ( protein: Pit-1, None) , ( protein: POU domain protein, None) , ( DNA: Pit-1, None) , ( protein: PRL, None) 