False-colour transmission electron micrograph (TEM) of spherical HIV-2 AIDS virus particles surrounding an infected T-lymphocyte. HIV-2 (human immunodeficiency virus type 2), is sufficiently different from the first AIDS virus (HIV-1) to warrant separate classification. HIV-2 is more closely related to the AIDS-like virus found in monkeys, called simian immunodeficiency virus (SIV). The image is dominated by darkly-stained genetic material located inside the wall of the large T-cell nucleus; this is the construction material for the process of viral replication. Magnification: x4850 at 35mm size. Coloured yellow. Original is BW print M050/110.