So when this infected cell actually lyses it breaks open and releases the newly formed viruses. And these viruses eventually make their way to these healthy cells. These nearby healthy cells have already mounted a defense and are ready for that viral attack. 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.