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Lastly, the final line of defense for the innate response to viruses lies in the actions of '''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.

Lastly, the final line of defense for the innate response to viruses lies in the actions of [[Lymphocytes - WikiBlood#NK Cells|'''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=