And so those polypeptides that are methylated basically increase their hydrophobic character as well. Now methylation is utilized in a process known as epigenetic regulation which is basically the regulation of gene expression that takes place during the process of transcription. Now let's move on to the third type of posttranslational modification known as glycosylation. 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.