Neuraminic AcidsSialic AcidsNeuraminidaseN-Acetylneuraminic AcidHexosaminesG(M3) GangliosideGangliosidesSpectrometry, Mass, Fast Atom BombardmentChromatography, Thin LayerCarbohydratesEchinodermataCarbohydrate SequenceCytidine Monophosphate N-Acetylneuraminic AcidOxo-Acid-LyasesSialyltransferasesCarbohydrate ConformationLectinsChromatography, GelChromatography, PaperGlycopeptidesMagnetic Resonance SpectroscopyOligosaccharidesErythrocytesGlycoproteinsMolecular Sequence Data