3694
We have previously shown that c-Jun is a potent inhibitor of the rat prolactin (rPRL) promoter activity induced by either oncogenic Ras or phorbol esters .
 ( protein: oncogenic Ras, None) , ( DNA: rat prolactin (rPRL) promoter, None) , ( protein: c-Jun, 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: oncogenic Ras, None) , ( DNA: rat prolactin (rPRL) promoter, None) , ( protein: c-Jun, None) 