35.7 MB (1.7 MB compressed)
3520 x 3543 pixels
29.7 x 30.0 cm ⏐ 11.7 x 11.8 in (300dpi)
EYE OF SCIENCE / SCIENCE PHOTO LIBRARY EYE OF SCIENCE / SCIENCE PHOTO LIBRARY
Natural killer cell. Coloured Scanning Electron Micrograph (SEM) of a human Natural Killer (NK) cell. The NK cell has numerous cellular projections which are used to attack foreign cells. Natural killer cells are a type of white blood cell. As part of the body's immune response mechanism, NK cells have the ability to destroy virus-infected cells & tumour cells. On contact with the surface of a tumour cell, the NK cell recognizes certain proteins called antigens, which activate its cell- killing mechanism. The NK cell then binds to & destroys the cancer cell using toxic chemicals. Magnification: x10,500 at 6x6cm size.
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