8746
However IL-7 , a crucial factor for thymopoiesis that is secreted mainly by TEC , is a necessary cofactor for NF-kappaB activation elicited by TNF or IL-1 .
 ( protein: TNF, None) , ( cell type: TEC, None) , ( protein: IL-1, None) , ( protein: NF-kappaB, None) , ( protein: IL-7, 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: TNF, None) , ( cell type: TEC, None) , ( protein: IL-1, None) , ( protein: NF-kappaB, None) , ( protein: IL-7, None) 