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Chondroitin sulfate is an acidic mucopolysaccharide extracted from animal cartilage, mainly composed of chondroitin sulfate A, C, and various mixtures of chondroitin sulfate cartilage. Chondroitin sulfate is widely present in animal cartilage, laryngeal bone, nasal bone, as well as in tissues such as tendons, ligaments, skin, and cornea. In cartilage, chondroitin sulfate binds to proteins to form proteoglycans and binds to collagen.