4667
We have demonstrated that the level of CRE binding protein ( CREB ) was the same in all cell lines and that the putative AR-CRE forms specific and compatible protein interactions with CREB .
 ( protein: CREB, None) , ( protein: AR-CRE, None) , ( protein: CREB, None) , ( protein: CRE binding protein, 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: CREB, None) , ( protein: AR-CRE, None) , ( protein: CREB, None) , ( protein: CRE binding protein, None) 