2.1.1.107	-	
2.1.1.107	by Ni–NTA column	
2.1.1.107	from recombinant E. coli	
2.1.1.107	from recombinant E. coli using His-tag	
2.1.1.107	Ni-NTA column chromatography, and gel filtration	
2.1.1.107	Ni2+-Sepharose column chromatography	
2.1.1.107	recombinant CobA/HemD , HemD, and CobA from Escherichia coli strain BL21(DE3) by nickel affinity chromatography	
2.1.1.107	recombinant His-tagged NirE from Escherichia coli by metal chelate chromatography and gel filtration to homogeneity	
2.1.1.107	recombinant protein