8
HIV-1 and HIV-2 display significant differences in nucleic acid sequence and in the natural history of clinical disease.
 ( DNA: nucleic acid sequence, 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: nucleic acid sequence, None) 