14217
Our previous studies on the function of the HIV-1-encoded Nef protein suggested that Nef may be an inhibitor HIV-1 transcription .
 ( protein: HIV-1-encoded Nef protein, None) , ( protein: Nef, 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: HIV-1-encoded Nef protein, None) , ( protein: Nef, None) 