2.6.1.11 - 2.6.1.11 arginine-inducible form, partial purification of arginine-repressible form 2.6.1.11 copurification of EC 2.6.1.11 and 2.6.1.13 2.6.1.11 Ni-NTA affinity column chromatography 2.6.1.11 partial 2.6.1.11 recombinant N-terminally His10-tagged enzyme from Escherichia coli strain DH5alpha by nickel affinity chromatography and ultrafiltration 2.6.1.11 using Ni-NTA chromatography