Blood cells and bacteria, SEM

Blood cells and bacteria, SEM

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Credit: JUERGEN BERGER/SCIENCE PHOTO LIBRARY

Caption: Blood cells and bacteria. Coloured scanning electron micrograph (SEM) of Staphylococcus aureus bacteria (yellow, round), a lymphocyte (white blood cell) and an erythrocyte (red blood cell). Lymphocytes are part of the body's immune system. There are three types of lymphocyte, B cells, T cells and natural killer cells. B cells produce antibodies that bind to pathogens to signal that they should be destroyed, helper T cells coordinate the immune response and cytotoxic T cells and natural killer cells kill body cells that have become infected with a pathogen.

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Keywords: anatomy, bacteria, bacterium, biological, biology, cells, coloured, defence, erythrocyte, false-coloured, human body, immune response, immune system, immunology, lymphocyte, microbiological, microbiology, pathogen, pathogenic, red blood cell, scanning electron micrograph, scanning electron microscope, sem, staphylococcus aureus, white blood cell

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