Heparan sulfate is a complex carbohydrate, specifically a type of glycosaminoglycan, found in the extracellular matrix of various tissues in the body. It plays a crucial role in cell signaling, influencing processes such as cell growth, development, and wound healing. This molecule is composed of repeating disaccharide units, which include glucosamine and iduronic acid. Heparan sulfate interacts with a variety of proteins, including growth factors and enzymes, helping to regulate their activity and availability in the body. Its diverse functions make it essential for maintaining normal physiological processes.