3131
However, it has been recently reported that the NH2 regulatory domain is sufficient to mediate CD4 accessory function .
 ( protein: CD4, None) , ( protein: regulatory domain, None) , ( protein: NH2, 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: CD4, None) , ( protein: regulatory domain, None) , ( protein: NH2, None) 