Now, proteins that leave our Golgi apparatus, once they are modified, leave in little sections, little structures known as secretory vesicles. And these are shown by these blue vesicles here. So once our protein is modified, for example, we add some type of sugar onto the protein. It leaves the Golgi apparatus inside a vesicle. And the reason it stays inside the vesicle is to protect the structure of our protein. So that vesicle can then basically go onto the membrane, and the protein can either remain in the membrane of the cell or it can secrete itself outside that cell.