4973
This unidentified factor binds immediately 3' of the PU.1 /Elf-1 sites and appears to be myeloid cell specific .
 ( protein: /Elf-1, None) , ( DNA: PU.1 /Elf-1 sites, None) , ( protein: PU.1, 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: /Elf-1, None) , ( DNA: PU.1 /Elf-1 sites, None) , ( protein: PU.1, None) 