Mast cell, SEM

Mast cell, SEM

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Caption: Mast cell. Coloured scanning electron micrograph (SEM) of a human mast cell. This is a leucocyte (white blood cell) that contains the chemical mediators histamine, serotonin and heparin. A mast cell is part of the immune system, and releases its contents during a localized inflammatory immune response to invading pathogens and during an allergic reaction. Histamine and serotonin cause the symptoms of allergies. Heparin is an anticoagulant which prevents abnormal clotting. Magnification unknown.

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Keywords: anatomy, blood, cellular, coloured, heparin, histamine, human body, immune system, immunity, immunology, inflammatory, leucocyte, leukocyte, mast cell, response, scanning electron micrograph, sem, serotonin, single, white

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