6892
In contrast, virus reactivation was not observed following CD4 oligomerization by antibodies that bind other epitopes in D1 , including the D1/CDR3-loop .
 ( protein: D1, None) , ( protein: CD4, None) , ( protein: D1/CDR3-loop, None) , ( protein: antibodies, 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: D1, None) , ( protein: CD4, None) , ( protein: D1/CDR3-loop, None) , ( protein: antibodies, None) 