12.0 MB (1.6 MB compressed)
2048 x 2048 pixels
17.3 x 17.3 cm ⏐ 6.8 x 6.8 in (300dpi)
JUERGEN BERGER / SCIENCE PHOTO LIBRARY JUERGEN BERGER / SCIENCE PHOTO LIBRARY
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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