TEM of killer T-lymphocyte attacking target cell

TEM of killer T-lymphocyte attacking 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) delivering the "kiss of death" 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. "Killer" T- cells recognize antigens on their target cell & bind to the surface membrane. Dark vesicles at edge of T-cell contain enzymes that penetrate the target cell membrane & destroy the cell.

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

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