9455
Electrophoretic mobility shift assays show that the nucleoprotein complex formed on the upstream site ( NF kappa B1 ) contains the classical p50/p65 heterodimer .
 ( protein: classical p50/p65 heterodimer, None) , ( protein: NF kappa B1, None) , ( protein: nucleoprotein complex, None) , ( DNA: upstream site, 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: classical p50/p65 heterodimer, None) , ( protein: NF kappa B1, None) , ( protein: nucleoprotein complex, None) , ( DNA: upstream site, None) 