Killer Cells, Natural

Cell, NK; Cell, Natural Killer; Cells, NK; Cells, Natural Killer; Killer Cell, Natural; NK Cell; Natural Killer Cell
Cells responsible for spontaneous cytotoxicity of a variety of tumor cells without prior immunization. These natural killer cells are found in non-immune humans and experimental animals and are thought by some to be the same as KILLER CELLS (killing by antibody-dependent cell cytotoxicity), but they can also kill in the absence of antibody.