immune disorders
Innate Immunity
Natural Killer Cells
Natural killer cells are called “natural” killers because they are ready to kill as soon as they are formed. Natural killer cells recognize and attach to infected cells or cancer cells, then release enzymes and other substances that damage the outer membranes of these cells. Natural killer cells are important in the initial defense against viral infections. Also, natural killer cells produce cytokines that regulate some of the functions of T cells, B cells, and macrophages. 