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The results identify functionally distinct epitopes on the CD4 coreceptor involved in activation of the Ras /protein kinase C and calcium pathways .
 ( protein: CD4 coreceptor, None) , ( protein: /protein kinase C, None) , ( protein: Ras, None) , ( protein: epitopes, None) , ( protein: Ras /protein kinase C, 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: CD4 coreceptor, None) , ( protein: /protein kinase C, None) , ( protein: Ras, None) , ( protein: epitopes, None) , ( protein: Ras /protein kinase C, None) 