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Lentivirus basics. (A) Simplified schematic of the wild-type human immunodeficiency virus type-1 (HIV-1) genome. (B) Lentivirus particle structure. (C) Plasmids used in the current (3rd generation) lentivirus packaging system. See the main text for a detailed description of the lentivirus packaging system; see Table 1 for lentivirus envelope proteins.
