And what the natural killer cells ultimately do is they destroy the infected cells and they also destroy cancer cells. Now, these interferons can also find these macrophages and they can guide the macrophages to the infected cell and these macrophages can ultimately engulf and degrade those infected cells. Now, on top of that, one other important aspect of these interferons is if the infection is too far along and the cell cannot be saved then what the interferon can actually do is they can initiate stimulate the cell death of that infected cell. For example, by breaking the Lysosomes and releasing the hydrocytic environment into the cytoplasm of that infected cell. And that will ultimately kill off our cells. So this is the method by which the innate, the nonspecific immune system of our body deals with viruses and other intracellular parasites that actually infect ourselves.