Macrophage and T cell. Coloured scanning electron micrograph (SEM) showing the interaction between a macrophage (large cell) and a CD4+T cell, two com
Macrophage and T cell. Coloured scanning electron micrograph (SEM) showing the interaction between a macrophage (large cell) and a CD4+T cell, two components of the body's immune system. Both are types of white blood cell. Macrophages are antigen-presenting cells (APCs). They present antigens (fragments on the surface of pathogens or foreign objects) to T lymphocytes, activating them. Each T lymphocyte recognises and binds to a specific antigen. Binding of the T cell to the antigen presented by the macrophage activates the T cell. This leads to its proliferation and the activation of other immune cells that eliminate the antigen. In this case, the cells come from the same person, and so the lower T-cell is moving away having established a friendly contact. Specimen courtesy of Greg Towers and Lydia Newton, UCL. Magnification: x7000 when printed 10cm wide.
Size: 4700px × 4045px
Photo credit: © ***DEPENDS ON PIC***/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No
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