The natural killer cells that circulate the body:

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Natural killer (NK) cells are a type of lymphocyte (a white blood cell) that play a crucial role in the innate immune system. They target and kill virally infected cells and tumor cells by injecting them with cytotoxic chemicals, leading to the death of these diseased cells. This process does not involve engulfing pathogens or pushing cells to the spleen, and NK cells do not disappear by middle age but remain a vital part of the immune system throughout life.

The Natural Killer Cells That Circulate the Body