STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Leukaemia cell in a patient with Bloom's syndrome, coloured transmission electron micrograph (TEM). Leukaemias are a group of malignant (cancerous) diseases caused by the uncontrollable proliferation of white blood cells. Bloom's syndrome is a rare genetic disorder that, among other symptoms, causes a greater susceptibility to cancers, especially leukaemias. This cell has the typical morphology of a cancer cell. The cell wall is covered in many small projections and the cytoplasm (brown) contains a large number of highly active mitochondria (black dots). Magnification: x2900 when printed at 10 centimetres wide.
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