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Ganglioside lactones in Minke whale brain were analysed. In order to exclude the possibility of the artificial lactonization of gangliosides during the analytical procedures, lactone species were separated from their parent gangliosides at an early stage by DEAE-Sephadex A-25 column chromatography using a stepwise elution. Applying the improved method, GM4 1 lactones were found in gray and...
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