8894
The mammalian NF-kappaB and octamer binding sites seem to be absent, although there are alternative potential NF-kappaB and octamer-binding elements in the chicken IL2 promoter , in close proximity to their mammalian homologues .
 ( protein: mammalian NF-kappaB, None) , ( DNA: mammalian homologues, None) , ( protein: IL2, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( DNA: octamer-binding elements, None) , ( DNA: chicken IL2 promoter, None) , ( DNA: octamer binding sites, 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: mammalian NF-kappaB, None) , ( DNA: mammalian homologues, None) , ( protein: IL2, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( DNA: octamer-binding elements, None) , ( DNA: chicken IL2 promoter, None) , ( DNA: octamer binding sites, None) 