Glycosaminoglycans are long unbranched chains of complex carbohydrates. They're found in all the different... Like cartilage? Yeah. Because it's like stelicosamine. So if you think about the different types of gags, right? You've got the conjointin sulfate, heparin sulfate,. keratin sulfate, hyaluronic acid. All slightly perform different functions depending on where they are. For example, hyalURonic acid is in joints, plays a really important role as like a shock absorber and lubricant.