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Natural killer cells or NK cells are a type of cytotoxic lymphocyte critical to the innate immune system.his role of NK cells is critical to immune success particularly because T cells are unable to recognize pathogens in the absence of surface antigens. Tumor cell detection results in activation of NK cells and consequent cytokine production and release.
Dendritic cells are also proving to be major adjuvants in cancer vaccine research. Natural killer cells (NK cells) are a type of cytotoxic T-cell that are not specific for one cancer cell type, as are the tumor specific cells produced in response to dendritic cells.riginally NK cells were thought to simply attack cancer cells when they find them and not require activation by finding a specific cancer cell marker, hence the name natural killer cells. We now know that they are activated by lack of a cell marker that identifies the cell as âselfâ that is normal to the body.