So although these natural killer cells are not really involved in the inflammation process directly, they do kill off infected cells that have been infected by, let's say, some type of viral agent. And they do kill off cancer cells in a non specific way. And that means these cells don't care about any type of specific antigen that might exist on the membrane of those cells. If the natural kill knows it's either an infected cell or a cancer cell, it will kill off those cells. So the natural kill cell is a non specific wide blood cell that kills off these pathogens infected cells and cancer cells without worrying about the specific type of antigen that exists on the membrane of those cells. So this is what we call the innate immune system.