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 (debris at 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 and release enzymes that disrupt the target cell membrane causing the cell's ultimate destruction | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Edelmann |
Bildgröße: | 5020 px × 3496 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: |
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