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Algin is a linear long-chain molecule irregularly linked by 1,4-mannuronic acid (M) and 1,4-guluronic acid (G). It is a functional oligosaccharide obtained through a certain cleavage reaction. It is fucoidan oligosaccharide. It is soluble in water and has strong stability. An oligosaccharide derived from brown algae. Oligosaccharides are also called oligosaccharides. Fucoidan oligosaccharide is a functional oligosaccharide, a linear oligosaccharide composed of β-D mannuronic acid and α-L guluronic acid connected through β-1-4 glycosidic bonds, also known as plant vaccine. It has the characteristics of low molecular weight, good water solubility, safety, non-toxicity and good compatibility.