And what diapedesis is, it's the movement, it's the squeezing of these leukocides through the tiny slits and crevices found between the endothelial cells of our capillaries. So our capillaries consist of this tiny layer of endothelial cells and between these cells we have very tiny holes. And that's where the leukocytes actually move through via the process of diabetesis. Now, let's begin by taking a look at granular sites. Question number one is why do we call them granular sites? Well, if we take a granular side and we have three different types of granular sites, each one of the granular side will look very similar under the microscope.