8539
Fas ( CD95 ) and Fas ligand ( CD95L ) are an interacting receptor-ligand pair required for immune homeostasis .
 ( protein: Fas, None) , ( protein: Fas ligand, None) , ( protein: CD95L, None) , ( protein: receptor-ligand pair, None) , ( protein: CD95, 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: Fas, None) , ( protein: Fas ligand, None) , ( protein: CD95L, None) , ( protein: receptor-ligand pair, None) , ( protein: CD95, None) 