JOHN DURHAM / SCIENCE PHOTO LIBRARY JOHN DURHAM / SCIENCE PHOTO LIBRARY
Light micrograph of a blood film from a patient with acute lymphoblastic leukaemia (ALL) showing lymphocytes (stained purple). The normal white blood cell count is 4 to 8 thousand per cubic mm; this patient's count was 160 thousand. Leukaemia is a malignant disease in which the bone marrow and other blood-forming tissues overproduce certain types of white blood cells. These immature and abnormal cells suppress the normal production of white and red cells, thereby increasing the susceptibility to other diseases such as anaemia. Magnification: x630 at 35mm size.
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