3357
IEF-1 , a pancreatic beta-cell type-specific complex believed to regulate insulin expression , is demonstrated to consist of at least two distinct species, one of which does not contain Pan molecules .
 ( protein: IEF-1, None) , ( protein: Pan molecules, 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: IEF-1, None) , ( protein: Pan molecules, None) 