14382
In addition to these novel E2F complexes , three distinct forms of unbound (free) E2F were resolved in gel shift experiments .
 ( protein: E2F, None) , ( protein: novel E2F complexes, None) , ( protein: E2F, 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, None) , ( protein: novel E2F complexes, None) , ( protein: E2F, None) 