3.1.2.22	-	
3.1.2.22	by centrifugation, dialysis and gel filtration	
3.1.2.22	GST affinity chromatography, GST-tag cleaved from GST-fusion protein	
3.1.2.22	recombinant PPT2 from overexpressing insect cells, recombinant PPT2 mutant from COS cells