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. Water molecules contain a partial positive charge on the hydrogen ions. And what that means when these Agrican molecules are in their initial position, we'll see that a bunch of water molecules will be absorbed and attached onto these glycosaminoglycans. The red ones are the conroytin sulfates and the brown ones are the keratin sulfates.