10382
These data provide direct evidence for the involvement of NF-kappaB /Rel family proteins in late stages of T lymphocyte development , coincident with positive and negative selection.
 ( protein: NF-kappaB, None) , ( cell type: T lymphocyte, None) , ( protein: NF-kappaB /Rel family proteins, 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: NF-kappaB, None) , ( cell type: T lymphocyte, None) , ( protein: NF-kappaB /Rel family proteins, None) 