Why are NK cells called "natural killers"?
◦ NK cells result from the interaction of N cells and K cells, making them more powerful lymphocytes than either cell by itself.
◦ NK cells have the ability to anticipate when antigens will enter the body, and proactively destroy them before they do so.
◦ NK cells are naturally produced from the deactivated antigens in the body.
◦ NK cells can detect foreign invaders in the body that get missed by B cells and T cells, and attack them directly.