<unk>  is a sulfated glycosaminoglycan (GAG) composed of a chain of alternating sugars (N-acetylgalactosamine and glucuronic acid). It is usually found attached to proteins as part of a proteoglycan. A<unk>  chain can have over 100 individual sugars, each of which can be sulfated in variable positions and quantities.  Understanding the functions of such diversity in<unk>  and related glycosaminoglycans is a major goal of glycobiology.<unk>  is an important structural component of cartilage and provides much of its resistance to compression. Along with glucosamine,<unk>  has become a widely used dietary supplement for treatment of osteoarthritis.
Chondroitin sulfate
Dermatan sulfate
Heparan sulfate
Hyaluronic acid 
Keratan sulfate
Sarcoglycan
Oxidized cellulose
Lecithin