EDELMANN / SCIENCE PHOTO LIBRARY EDELMANN / SCIENCE PHOTO LIBRARY
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. 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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