5319
The third approach was to monitor the replication competence in U937 cells of an infectious HIV-1 provirus carrying point mutations in the kappaB-responsive elements of both long terminal repeats .
 ( DNA: long terminal repeats, None) , ( DNA: kappaB-responsive elements, None) , ( cell line: U937 cells, 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:
 ( DNA: long terminal repeats, None) , ( DNA: kappaB-responsive elements, None) , ( cell line: U937 cells, None) 