Neuraminic AcidsMonosaccharidesSialic AcidsNeuraminidaseN-Acetylneuraminic AcidHexosaminesG(M3) GangliosideGangliosidesSpectrometry, Mass, Fast Atom BombardmentCarbohydratesCarbohydrate SequenceChromatography, Thin LayerEchinodermataCarbohydrate ConformationCytidine Monophosphate N-Acetylneuraminic AcidLectinsOxo-Acid-LyasesOligosaccharidesSialyltransferasesGlycopeptidesMagnetic Resonance SpectroscopyChromatography, GelChromatography, PaperGlycoproteinsErythrocytesMolecular Sequence DataMolecular WeightDisaccharides