Natural killer cell attacking target, illustration
Conceptual illustration of a natural killer (NK) cell (yellow) attacking a target cell (blue). NK cells are a type of white blood cell and a component of the immune system. They recognise certain proteins, or antigens, on virus-infected or tumour cells and destroy them by secreting cytokines, porins, free radicals and other substances (pink)., by RAMON ANDRADE 3DCIENCIA/SCIENCE PHOTO LIBRARY
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