8547
Sp1 and NF-kappaB transcription factor binding was shown to be mutually exclusive by EMSA displacement studies with purified recombinant Sp1 and recombinant p50 .
 ( protein: Sp1, None) , ( protein: NF-kappaB, None) , ( protein: Sp1, None) , ( protein: p50, 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: Sp1, None) , ( protein: NF-kappaB, None) , ( protein: Sp1, None) , ( protein: p50, None) 