24
We have investigated the effect of CD4 triggering on T cell activating signals in a lymphoma model using monoclonal antibodies ( mAb ) which recognize different CD4 epitopes .
 ( protein: CD4, None) , ( protein: monoclonal antibodies, None) , ( protein: mAb, None) , ( protein: CD4 epitopes, 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, None) , ( protein: monoclonal antibodies, None) , ( protein: mAb, None) , ( protein: CD4 epitopes, None) 