Now, another type of innate immune cell is the natural killer cell. Now, these natural killer cells as shown the following diagram basically have a special receptor on that cell. And these receptors can bind onto either infected cells that have been infected with some type of viral agent or they can abide onto cancer cells and destroy those cancer cells. So these natural killer cells circulate inside our blood and they respond to these cytokines released by the math cell and other cells and they move into that infected area from the blood into the tissue. So these natural killer cells circulates in the blood and moves into effective tissue. They bind onto cancer cells or infected cells and once they bind they release powerful digestive enzymes that drill holes in that infected cell or cancer cell and that lysis our cell.