4.2.3.1	-	137544, 137546, 137549, 137550, 137551, 137557	
4.2.3.1	native and recombinant enzymes	137555	
4.2.3.1	native enzyme	137556	
4.2.3.1	Ni2+-affinity chromatography	696127	
4.2.3.1	partial	137545, 137548	
4.2.3.1	recombinant enzyme	137561	
4.2.3.1	using Ni-NTA chromatography	728848