TEM of killer T-lymphocyte attached to target cell

TEM of killer T-lymphocyte attached to target cell

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Credit: EDELMANN/SCIENCE PHOTO LIBRARY

Caption: False-colour transmission electron micrograph (TEM) of a single, activated cytotoxic ("killer") T-lymphocyte (left, a class of white blood cell) attached to its target cell. T-lymphocytes are involved in cell-mediated response to invasion of body by foreign microorganisms, notably viruses and some bacteria, which are protected from antibodies (secreted by B-lymphocytes) by their host cells. Unlike B-lymphocytes, T-cells do not produce antibodies; instead they recognize selective surface antigens on infected cells. Killer T-cells proceed to destroy infected target cells by direct contact.

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Keywords: activated, anatomy, cell-mediated response, cells, cytotoxic destruction, human body, immune, immune response, t-lymphocyte, white blood cell

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