13980
Tumor necrosis factor receptor-activated factor 6 ( TRAF6 ) and the nuclear factor kappaB ( NF-kappaB )-inducing kinase ( NIK ) are both involved in subsequent steps of NF-kappaB activation .
 ( protein: NF-kappaB, None) , ( protein: NF-kappaB, None) , ( protein: nuclear factor kappaB ( NF-kappaB )-inducing kinase, None) , ( protein: nuclear factor kappaB, None) , ( protein: TRAF6, None) , ( protein: Tumor necrosis factor receptor-activated factor 6, None) , ( protein: NIK, 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) , ( protein: NF-kappaB, None) , ( protein: nuclear factor kappaB ( NF-kappaB )-inducing kinase, None) , ( protein: nuclear factor kappaB, None) , ( protein: TRAF6, None) , ( protein: Tumor necrosis factor receptor-activated factor 6, None) , ( protein: NIK, None) 