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<p><b>Natural killer cells</b>, also known as <b>NK cells</b>, are a type of <a href="page.php?w=cytotoxic">cytotoxic</a> <a href="page.php?w=lymphocyte">lymphocyte</a> critical to the <a href="page.php?w=innate_immune_system">innate immune system</a>. They are a kind of large granular lymphocyte (LGL), belong to the rapidly expanding family of known <a href="page.php?w=innate_lymphoid_cell">innate lymphoid cell</a>s (ILC), and represent 5-20% of all circulating lymphocytes in humans. The role of NK cells is analogous to that of <a href="page.php?w=cytotoxic_T_cell">cytotoxic T cell</a>s</p><p>
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