13786
Consistent with the requirement for PC4 in the reconstituted system , OCA-B was found to interact directly with PC4 .
 ( protein: PC4, None) , ( protein: PC4, None) , ( protein: OCA-B, 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: PC4, None) , ( protein: PC4, None) , ( protein: OCA-B, None) 