13415
Apoptosis was prevented when CD4 truncated at residue 402 was expressed; however, cells expressing mutated receptors that do not associate with p56(lck) (mutated at the dicysteine motif and truncated at residue 418 ) but which conserved proximal domains of the cytoplasmic tail underwent apoptosis like wild- type CD4 .
 ( protein: wild- type CD4, None) , ( protein: CD4, None) , ( protein: cytoplasmic tail, None) , ( protein: dicysteine motif, None) , ( protein: p56(lck), None) , ( protein: CD4, 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: wild- type CD4, None) , ( protein: CD4, None) , ( protein: cytoplasmic tail, None) , ( protein: dicysteine motif, None) , ( protein: p56(lck), None) , ( protein: CD4, None) 