So glycosylation is the process by which we add a sugar component onto our polypeptide chain. Now, by adding a sugar component we basically affect the proteins folding process as well as change the confirmation of that protein. Now one example of proteins that are glycosylated are those proteins that ultimately end up on the plasma membrane of the cell. And these proteins usually act as receptors for other important biological molecules such as, for example, neurotransmitters. Now let's move on to the fourth type of post translational modification process known as proteolysis. So proteollysis is basically the process by which certain types of enzymes known as proteases actually cut our proteins.