13418
Incubation of HIV-infected cells with monoclonal antibody (MAb) 13B8-2 , which binds to CD4 in a region critical for dimerization of the receptor, prevented apoptosis without inhibiting HIV replication .
 ( protein: monoclonal antibody (MAb) 13B8-2, None) , ( cell type: HIV-infected cells, 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: monoclonal antibody (MAb) 13B8-2, None) , ( cell type: HIV-infected cells, None) , ( protein: CD4, None) 