12371
Its extracellular domain is composed of four cysteine-rich domains , and the cytoplasmic region contains a death domain known to signal apoptosis .
 ( protein: death domain, None) , ( protein: cysteine-rich domains, None) , ( protein: cytoplasmic region, 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: death domain, None) , ( protein: cysteine-rich domains, None) , ( protein: cytoplasmic region, None) 