Now, macrophages are the largest type of white blood cell. They're much larger than neutrophils and that's exactly why they can actually engulf and break down about 100 bacterial cells before they actually die off and become pus. Now, the last type of cell that I'd like to discuss but I should note that is not actually part of the inflammation process directly is a cell known as the natural killer cell. 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.