Electrophoresis, DiscElectrophoresis, Polyacrylamide GelMolecular WeightAmido BlackBlood Protein ElectrophoresisElectrophoresisChromatography, GelAmino AcidsImmunodiffusionUltracentrifugationIsoelectric FocusingImmunoelectrophoresisGelsChromatography, DEAE-CelluloseChromatographyChemical PrecipitationHydrogen-Ion ConcentrationCarbohydratesIntervertebral DiscElectrophoresis, Gel, Two-DimensionalKineticsElectrophoresis, CapillaryElectrophoresis, Agar GelElectrophoresis, Gel, Pulsed-FieldRabbitsIntervertebral Disc DisplacementIsoelectric Point