Now, let's move on to addition of sugar group. So many, many proteins inside our body are modified by adding carbohydrate components. For example, the proteins that are destined to be in a cell membrane or outside the cell, they're modified in this way. And the reason we add carbohydrate components is to basically increase the polarity, increase the hydrophilic nature of those proteins, so that they can interact better with other proteins as well as with other hydrophilic molecules. So, for example, we can have asparagne, the amino acid asparagine be modified by the addition of the sugar component. And all these different hydroxyl groups basically increases the hydrophilic nature of that protein.