1.8.4.13	native enzyme about 1100fold by ammonium sulfate fractionation, anion exchange chromatography, gel filtration, again anion exchange chromatography, heat treatment, and hydroxyapatite chromatography to near homogeneity	
1.8.4.13	native enzyme partially by subcellular fractionation	
1.8.4.13	two native enzyme forms by ammonium sulfate fractionation, anion exchange chromatography, and a calcium phosphate resin chromatography