And that means inside our ribosome, inside our rough Er, when we synthesize the proteins, we also add a special type of signal known as the signal sequence, or the peptide sequence onto the protein. And that signal sequence basically signifies the fact that the protein's destination is either in the cell membrane or it's outside the cell. And when the protein ends up in our Golgi apparatus, that sequence is modified. So, basically, we can modify proteins in the Golgi apparatus either by adding carbohydrates on it or modifying in some other type of way. For example, we phosphorylate our proteins now, inside the Golgi apparatus, we also form several types of polysaccharides. So our Golgi apparatus contains many important enzymes that are involved in forming different types of polysaccharides of sugars.