12922
The observation that human herpesvirus 6 ( HHV-6 ) can induce CD4 gene transcription and expression in CD4(-) cells was reported several years ago (P.Lusso, A.De Maria, M.Malnati, F.Lori, S.E.DeRocco, M. Baseler, and R.C.Gallo, Nature 349:533-535, 1991) and subsequently confirmed (P.Lusso, M.S.Malnati, A.Garzino-Demo, R.W.Crowley, E. O.Long, and R.C.Gallo, Nature 362:458-462, 1993; G.Furlini, M. Vignoli, E.Ramazzotti, M.C.Re, G.Visani, and M.LaPlaca, Blood 87:4737-4745, 1996).
 ( DNA: CD4 gene, None) , ( cell line: 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:
 ( DNA: CD4 gene, None) , ( cell line: CD4(-) cells, None) 