4972
Electrophoretic mobility shift analyses demonstrated that the 151-bp region contains nuclear protein binding sites for Sp1 , PU.1 , and/or Elf-1 , and a novel factor .
 ( DNA: nuclear protein binding sites, None) , ( protein: novel factor, None) , ( protein: PU.1, None) , ( protein: Elf-1, None) , ( protein: Sp1, None) , ( DNA: 151-bp region, 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:
 ( DNA: nuclear protein binding sites, None) , ( protein: novel factor, None) , ( protein: PU.1, None) , ( protein: Elf-1, None) , ( protein: Sp1, None) , ( DNA: 151-bp region, None) 