Natural killer (NK) cell, coloured scanning electron micrograph (SEM). NK cells are a type of white blood cell and a component of the body's immune system. They recognise certain proteins, or antigens, on virus-infected or tumour cells and destroy them. Magnification x 12000 at 10cm wide. Specimen courtesy of the Maini Lab. UCL.

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Photo credit: © STEVE GSCHMEISSNER/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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Keywords: biological, biology, cell, coloured, cytotoxic, false-coloured, healthy, im, killer, natural, sem