9497
A subpopulation of stably infected CD4+ cells capable of producing virus upon stimulation has been identified in human immunodeficiency virus ( HIV )-positive individuals (T.-W.Chun, D.Finzi, J.Margolick, K.Chadwick, D.Schwartz, and R.F.Siliciano, Nat.Med.1:1284-1290, 1995).
 ( cell type: stably infected CD4+ 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:
 ( cell type: stably infected CD4+ cells, None) 