BONHOMME, ISM / SCIENCE PHOTO LIBRARY BONHOMME, ISM / SCIENCE PHOTO LIBRARY
Leukaemia blood cells. Light micrograph of blood cells in a blood smear from a patient with lymphatic leukaemia. The large cells with dark nuclei (internal structures that contain their genetic information) are white blood cells. The smaller, paler cells are red blood cells. Leukaemia is a cancer of the white blood cells, leading to an increase in their number. Lymphatic leukaemia affects the lymphatic system, such as the lymph glands, and the white blood cells known as lymphocytes. The other main type of leukaemia affects a different type of white blood cell.
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