2484
However, it was not possible to ascertain whether Bcl-2 upregulation was a specific consequence of LMP1 expression or an artifact of the selection procedure whereby rare Bcl-2 + cells already present in the starting population might best be able to tolerate the potentially toxic effects of LMP1 .
 ( protein: Bcl-2, None) , ( protein: LMP1, None) , ( cell line: Bcl-2 + cells, None) , ( protein: Bcl-2, None) , ( protein: LMP1, 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: Bcl-2, None) , ( protein: LMP1, None) , ( cell line: Bcl-2 + cells, None) , ( protein: Bcl-2, None) , ( protein: LMP1, None) 