title: Comparison of methods for purification of diphtheria toxin with special reference to gelfiltration and ion-exchange chromatography.
mesh_terms: D011232:Chemical Precipitation; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004167:Diphtheria Toxin; D000644:Quaternary Ammonium Compounds; D013431:Sulfates
chemical_list: D004167:Diphtheria Toxin; D000644:Quaternary Ammonium Compounds; D013431:Sulfates