Now, on top of that, these interferons can also actually bind to these other specialized leukocytes, these other specialized white blood cells. So we have macrophages and we have natural killer cells. So once the interferon interacts with the natural killer cell it essentially guides that killer cell to this infected cell. 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.