50.8 MB (1.3 MB compressed)
5086 x 3490 pixels
43.2 x 29.5 cm ⏐ 17.0 x 11.6 in (300dpi)
BSIP, SECCHI LECAQUE / SCIENCE PHOTO LIBRARY BSIP, SECCHI LECAQUE / SCIENCE PHOTO LIBRARY
Killer T-lymphocyte attacking a cell. Coloured Scanning Electron Micrograph (SEM) of a T- lymphocyte killer cell attacking a larger cell. Three small rounded killer T-lymphocyte cells, a type of white blood cell, are seen at right. One of these smaller cells (near centre) has attached itself to a large undifferentiated cell (at right) and is attacking it. It recognises the larger cell (which may be a virus infected cell or a cancer cell) by its surface antigens. Once it attaches it will kill the cell, so acting as an important mechanism in the body's immune response. Magnification: unknown.
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