The Vpr protein of human immunodeficiency virus type 1 influences nuclear localization of viral nucleic acids in nondividing host cells. - Heinzinger,N.K.; Bukinsky,M.I.; Haggerty,S.A.; Ragland,A.M.; Kewalramani,V.; Lee,M.A.; Gendelman,H.E.; Ratner,L.; Stevenson,M.; Emerman,M. (Proc Natl Acad Sci U S A, 1994)