| an isolate of human immunodeficiency virus type 1 originally classified as subtype i represents a complex mosaic comprising three different group m subtypes (a, g, and i). | full-length reference clones and sequences are currently available for eight human immunodeficiency virus type 1 (hiv-1) group m subtypes (a through h), but none have been reported for subtypes i and j, which have only been identified in a few individuals. phylogenetic information for subtype i, in particular, is limited since only about 400 bp of env gene sequences have been determined for just two epidemiologically linked viruses infecting a couple who were heterosexual intravenous drug users ... | 1998 | 9811767 |