POWER AND SYRED / SCIENCE PHOTO LIBRARY POWER AND SYRED / SCIENCE PHOTO LIBRARY
Light micrograph showing two neutrophils, the most common type of leucocyte (white cell) in blood. Neutrophils are formed in the bone marrow and use the blood as a transport system to reach sites of infection in the tissues, where they engulf invading micro-organisms. They constitute 40 to 75 per cent of circulating leucocytes. A neutrophil has a single, highly lobulated nucleus (purple stain). In the mature neutrophil there are usually five lobes connected by fine strands of nuclear material, but in immature cells the nucleus is generally less lobulated. The pale bodies surrounding the neutrophils are erythrocytes (red blood cells). Magnification: x1000 at 35mm size.
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