1816
This was in sharp contrast to endometrial cells where 3 kb 5'-flanking DNA conferred strong transcriptional activation on the dPRL promoter in decidualized endometrial stromal cells actively secreting PRL , but did not allow transcription in undifferentiated non-PRL-secreting endometrial stromal cells .
 ( protein: PRL, None) , ( cell type: non-PRL-secreting endometrial stromal cells, None) , ( cell type: endometrial stromal cells, None) , ( DNA: dPRL promoter, 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:
 ( protein: PRL, None) , ( cell type: non-PRL-secreting endometrial stromal cells, None) , ( cell type: endometrial stromal cells, None) , ( DNA: dPRL promoter, None) 