5379
Although prior studies suggest a role for protein tyrosine kinases and phosphatases in Fas signaling , we report here that Fas ligation induces apoptosis in T cells deficient in either CD45 or Lck .
 ( cell type: T cells, None) , ( protein: protein tyrosine kinases, None) , ( protein: Lck, None) , ( protein: Fas, None) , ( protein: CD45, 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:
 ( cell type: T cells, None) , ( protein: protein tyrosine kinases, None) , ( protein: Lck, None) , ( protein: Fas, None) , ( protein: CD45, None) 