Lymphocyte white blood cell, SEM

Lymphocyte white blood cell, SEM

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Credit: STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY

Caption: Lymphocyte white blood cell, scanning electron micrograph (SEM). Its surface is covered in characteristic microvilli. Lymphocytes are divided into either B-cells or T-cells. B-cells mature in bone marrow and are responsible for humoural immunity; they operate by recognising a specific site on the surface of a pathogen or foreign object (antigen), which they then bind to before producing antibodies to destroy that antigen. T-cells mature in the thymus and are involved in cell-mediated immunity, which does not rely on antibodies to fight antigens, but rather the activation of macrophages, NK-cells, cytotoxic T-lymphocytes and various cytokines. Magnification: x6000 when printed at 10 centimetres wide.

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Keywords: b-cell, biological, biology, cell, colored, coloured, defence, defense, false coloured, false-coloured, images, immune system, immunity, immunological, immunology, lymphocyte, magnified image, medical, medicine, microscopic photos, monochrome, one, response, scanning electron micrograph, scanning electron microscope, sem, single, t-cell, wbc, white blood cell

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