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Lastly, the final line of defense for the innate response to viruses lies in the actions of [[Lymphocytes - WikiBlood|'''Natural Killer (NK) cells''']].  These warriors monitor the production of 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 - WikiBlood|'''Natural Killer (NK) cells''']].  These warriors monitor the production of 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.
    
=Innate Immunity to Bacteria=
 
=Innate Immunity to Bacteria=
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