So we see that heparin contains many of these negative charges and these negative charges give the heparin its functionality. Now the other three glycosaminoglycans we haven't yet discussed and we're going to focus on them in this lecture. So we have conroytin six sulfate, or simply conjoitin sulfate. We have keratin sulfate and we also have a hyaluronate. Now let's take a look at conroytin sulfate. In conjoitin sulfate, this is our disaccharide unit.