Phagocytosis is a much more specific endocytotic process and only certain types of cells can actually undergo this process. So one example is the phagocyte, that is, the cell found in the immune system of our body. We'll discuss more of the phagocytes when we discuss the immune system. So in this process of phagocytosis some type of relatively large molecule such as a macromolecule or even a bacterium binds to specific protein receptors found on the cell membrane. Once that protein receptor binds to the receptor on that molecule, let's say our bacteria the cell recognizes the material protrudes outward and engulfs that object. And once inside that vesicle, because it's so large, is known as the phagosome.