JOHN DURHAM / SCIENCE PHOTO LIBRARY JOHN DURHAM / SCIENCE PHOTO LIBRARY
Light micrograph of a blood film from a patient with acute lymphoblastic leukaemia (ALL). White blood cells stain purple. This area of the field is sparsely populated by white cells (there are two lymphocytes, and one neutrophil in the lower right-hand corner) and does not itself indicate leukaemia. The patient's white blood cell count, however, was 160 thousand per cubic mm (normal; 4-8 thousand). In leukaemia the bone marrow and other blood-forming tissues overproduce certain types of white blood cells. As a result the normal production of white and red cells is suppressed, thereby increasing the susceptibility to other diseases. Magnification: x787.5 at 35mm size.
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