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Schematic diagram of the repeating saccharide units in chitosan oligosaccharide and its acetylated derivatives. (A–C) Chemical structure of chitosan oligosaccharides (COS) (A), N-acetylated chitosan oligosaccharides (NACO) (B), and peracetylated chitosan oligosaccharides (PACO) (C). The degree of polymerization (DP) of COS, NACO, and PACO is 2~4.
