Lastly, the final line of defense for the innate response to viruses lies in the actions of [[Lymphocytes#Natural Killer (NK) Cells|'''Natural Killer (NK) cells''']]. These warriors monitor the production of [[MHC - WikiBlood|MHC]] (Major Histocompatibility Complex) on the surface of cells, which is produced as part of the adaptive response. A cell whose cellular machinery is compromised by viral infection will experience a drop in the amount of MHC it produces. When a cell's MHC production drops, NK cells are triggered to phagocytose these cells. As such, this is a non-specific targeting based simply on the ability of a cell to function normally, which also lends them to playing a role in targeting malignant cells. NK cells are incapable of directly targeting viral infection.
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Lastly, the final line of defense for the innate response to viruses lies in the actions of [[Natural Killer cells|'''Natural Killer (NK) cells''']]. These warriors monitor the production of [[MHC - WikiBlood|MHC]] (Major Histocompatibility Complex) on the surface of cells, which is produced as part of the adaptive response. A cell whose cellular machinery is compromised by viral infection will experience a drop in the amount of MHC it produces. When a cell's MHC production drops, NK cells are triggered to phagocytose these cells. As such, this is a non-specific targeting based simply on the ability of a cell to function normally, which also lends them to playing a role in targeting malignant cells. NK cells are incapable of directly targeting viral infection.