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Substance BS-3, a polysaccharide, produced by a microorganism belonging to the genus Klebsiella is disclosed, BS-3 having the following properties: main constituting sugar: rhamnose, galactose, glucose, and glucuronic acid; white to pale brown powder; easily soluble in water and sparingly soluble in methanol, ethyl acetate, benzene, etc.; viscosity: 1 to 8,000 cps; molecular weight: 1,000 to 10,000,000;...
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