6893
Finally, soluble CD4 ( sCD4 ) prevented virus reactivation by D1/CDR2-loop ligands .
 ( protein: soluble CD4, None) , ( protein: CD4, None) , ( protein: D1/CDR2-loop ligands, None) , ( protein: sCD4, 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: soluble CD4, None) , ( protein: CD4, None) , ( protein: D1/CDR2-loop ligands, None) , ( protein: sCD4, None) 