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Chitin is a straight-chain nitrogen-containing polysaccharide polymer, a type of mucopolysaccharide. Poly-β1-4-N-acetylglucosamine. The etymology originates from Kiton which was clothing of ancient Greece, and means "wrapper". It is a main component such as a cuticle covering the body surface of many invertebrates such as arthropods and exoskeletons of crustaceans or outer shells, shell surface of mollusks, and cell walls of fungi such as mushrooms. Thus, chitin, which is a natural product, is not only N-acetylglucosamine but also glucosamine as a constituent component, and the ratio of N-acetylglucosamine and glucosamine is said to be about 9: 1. Because chitin is a natural product, it seems that the ratio differs greatly depending on its origin, but chitin composed only of N-acetylglucosamine does not exist. ...