3.4.18.1 - 36443, 36645 3.4.18.1 purified 9.48fold via a one-step purification process using a DEAE-Sephagel HPLC column 691910 3.4.18.1 recombinant enzyme from Pichia pastoris by cation exchange chromatography 708738 3.4.18.1 recombinant GST-tagged enzyme from Escherichia coli strain BL21 by glutathione affinity and anion exchange chromatography 683378