False-colour TEM of killer T-lymphocyte

False-colour TEM of killer T-lymphocyte

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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 type of white blood cell) after delivering the "kiss of death" to its target cell (right). T-lymphocytes are part of the cell- mediated immune 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. "Killer" T-cells recognize antigens on their target cell, releasing enzymes that disrupt the target cells membrane and cause the cell's ultimate destruction.

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

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