So that means there are no memory immune cells that exist within our innate immune system and we'll talk more about memory cells in the next lecture. Now, the last thing I'd like to mention is the following. So we see that once the pathogen invades our tissue, the basic fields and mass cells secrete the histamine and other chemicals that ultimately make the capillaries more permeable to water more leaky. And that results in edema. It also results in the passageway of antibodies that flow into or out of our blood. Now, we also dilate those blood vessels and that gives us the redness along that area of infection and it also brings phagocytes, it also brings antibodies and nutrients to that infected area.