2.7.2.7	-	
2.7.2.7	ammonium sulfate precipitiation, heparin column chromatography, and Sephadex G25 gel filtration	
2.7.2.7	HisTrap column chromatography	
2.7.2.7	Ni-NTA resin column chromatography	
2.7.2.7	nickel affinity column chromatography	
2.7.2.7	partial