And remember that these projections, the red projections and these brown projections all consist of these repeating disaccharide units. And these repeating disaccharide units, this one and this one, contain these modified side chain groups that have negative charges. Now what does that mean? Well, because these disaccharide units have been modified with these negatively charged groups, that means they will be attracted to water molecules. Why? Well, because water molecules are polar.