10808
While several lines of investigation have suggested that NF-kappaB/Rel family members make up the CD28 response complex transcription factor , other work has not supported this conclusion.
 ( protein: transcription factor, None) , ( protein: CD28, None) , ( protein: NF-kappaB/Rel family members, 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: transcription factor, None) , ( protein: CD28, None) , ( protein: NF-kappaB/Rel family members, None) 