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This site is conserved among isolates of HIV-2 and the closely related simian immunodeficiency virus , and transfection assays show this site to mediate HIV-2 enhancer activation following stimulation of monocytic but not T-cell lines .
 ( DNA: HIV-2 enhancer, None) , ( cell line: T-cell lines, None) , ( cell line: monocytic, 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: HIV-2 enhancer, None) , ( cell line: T-cell lines, None) , ( cell line: monocytic, None) 