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Among the seven oligosaccharide fractions obtained by Bio-Gel P-4 column chromatography of urine of GM1-gangliosidosis Type 1 patients, three fractions (peaks V, VI, and VII) were completely missing in the urine of GM1-gangliosidosis Type 2 patients. Structural study of these oligosaccharide fractions by sequential exoglycosidase digestion in combination with methylation analysis and periodate oxidation has shown that peaks V, VI, and VII are mixtures of 16, 30, and 49 isomericpmid:6790542 fatcat:n4q7imv2irapji56niz7f6gk2q