False-colour transmission electron micrograph (TEM) of a single, activated cytotoxic (\killer\") T-lymphocyte (left, a class of white blood cell) deli

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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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Size: 4878px × 3595px
Photo credit: © EDELMANN/SCIENCE PHOTO LIBRARY / Alamy / Afripics
License: Licensed
Model Released: No

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