k Mast cell, TEM Mast cell. Coloured transmission electron micrograph TEM of a section through a mast cell, with vacuoles containing histamine or heparin. A mast cell is a leucocyte white blood cell that contains the chemical mediators histamine, serotonin and heparin. It 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 x8000 when printed at 10 centimetres wide., by STEVE GSCHMEISSNERSCIENCE PHOTO LIBRARY Stock Photo - Afloimages
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Mast cell, TEM Mast cell. Coloured transmission electron micrograph  TEM  of a section through a mast cell, with vacuoles containing histamine or heparin. A mast cell is a leucocyte  white blood cell  that contains the chemical mediators histamine, serotonin and heparin. It 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: x8000 when printed at 10 centimetres wide., by STEVE GSCHMEISSNER SCIENCE PHOTO LIBRARY
RM

Mast cell, TEM

Mast cell. Coloured transmission electron micrograph (TEM) of a section through a mast cell, with vacuoles containing histamine or heparin. A mast cell is a leucocyte (white blood cell) that contains the chemical mediators histamine, serotonin and heparin. It 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: x8000 when printed at 10 centimetres wide., by STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

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