2.7.2.8	-	642351, 642353, 642354, 642355, 642356, 642358, 674874, 689895, 705148	
2.7.2.8	recombinant enzyme	659050	
2.7.2.8	of the recombinant protein	671144, 672793, 673641	
2.7.2.8	affinity chromatography and gel filtration by binding to the PII protein, Ni-nitrilotriacetic acid agarose to purify the recombinant protein	674751	
2.7.2.8	His-Select nickel affinity gel column chromatography	702066	
2.7.2.8	using Ni-NTA chromatography	720845, 722087, 723557	
2.7.2.8	recombinant His-tagged wild-type and mutant enzymes from Escherichia coli BL21(DE3) by nickel affinity chromatography	735596	
2.7.2.8	Ni Sepharose column chromatography	761811