13426
p130 , predominantly in Form 1, and hypophosphorylated pRb bind an E2F DNA binding site ; p130 complexes E2F-4 , whereas pRb binds both E2F-4 and E2F-1 .
 ( protein: E2F-4, None) , ( DNA: E2F DNA binding site, None) , ( protein: p130, None) , ( protein: pRb, None) , ( protein: hypophosphorylated pRb, None) , ( protein: E2F-1, None) , ( protein: p130, None) , ( protein: pRb, 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: E2F-4, None) , ( DNA: E2F DNA binding site, None) , ( protein: p130, None) , ( protein: pRb, None) , ( protein: hypophosphorylated pRb, None) , ( protein: E2F-1, None) , ( protein: p130, None) , ( protein: pRb, None) 