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wood prints b-cell wood prints biological wood prints biology wood prints cell wood prints coloured wood prints defence wood prints false colour wood prints false-coloured wood prints images wood prints immune system wood prints immunity wood prints immunological wood prints immunology wood prints lymphocyte wood prints medical wood prints

photographs b-cell photos biological photos biology photos cell photos coloured photos defence photos false colour photos false-coloured photos images photos immune system photos immunity photos immunological photos immunology photos lymphocyte photos medical photos

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Coloured scanning electron micrograph (SEM) of dividing lymphocytes. Lymphocytes are a type of white blood cell involved in the immune system. 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: x 4000 when printed 10 centimetres wide.

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