53.5 MB (4.3 MB compressed)
4398 x 4252 pixels
37.3 x 36.1 cm ⏐ 14.7 x 14.2 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. 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: x7,500 at 6x6cm size.
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