1.1.1.26 - 1.1.1.26 partial 1.1.1.26 recombinant His-tagged enzyme from Escherichia coli strain BL21 by nickel affinity chromatography and gel filtration 1.1.1.26 recombinant His6-tagged enzyme from Escherichia coli strain BL21 by PEG precipitation, nickel affinity and anion exchange chromatography