29.4 MB (1.4 MB compressed)
3864 x 2656 pixels
32.8 x 22.6 cm ⏐ 12.9 x 8.9 in (300dpi)
BSIP PIR / SCIENCE PHOTO LIBRARY BSIP PIR / SCIENCE PHOTO LIBRARY
Killer T-lymphocyte. Coloured Scanning Electron Micrograph of a killer T-lymphocyte (green, in centre) stuck to a cluster of foreign red blood cells, which it is in the process of destroying. Killer T-lymphocytes are a type of white blood cell. They play an important role in the body's immune system by attacking and destroying foreign cells, such as these red blood cells. The lymphocyte binds to the foreign cells by receptors on its surface, and then injects lethal "lymphokines", which kill the invaders and burst their membranes. The same mechanism is also responsible for tissue rejection after organ transplants. Magnification unknown.
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