EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Budding HIV particles. Coloured transmission electron micrograph (TEM) of HIV particles (green and red) budding from the membrane of the host cell (brown). HIV (human immunodeficiency virus) attacks CD4+ T-lymphocytes (specialised white blood cells), which are crucial in the body's immune system. It enters the cell and makes many copies of itself, which then destroy the cell as they emerge through its membrane. This severely weakens the immune system, causing AIDS (acquired immunodeficiency syndrome). Magnification: x50000 when printed 10 centimetres tall.
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