False-colour transmission electron micrograph (TEM) of two virions or virus particles of the simian immunodeficiency virus (SIV). The viruses appear as small orange spheres with dark blue cores. SIV is responsible for an AIDS-like syndrome in monkeys, and is related to a second, more recently identified type of human AIDS virus, called human immunodeficiency virus type 2 (HIV-2). Magnification: x70,000 at 6x 4.5cm size.
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