3.4.24.B6 - 684767, 686743, 688000, 688001, 754269 3.4.24.B6 anion exchange chromatography and gel filtration 669508 3.4.24.B6 His-TRAP chelating nickel affinity column chromatography 720338 3.4.24.B6 native enzyme from soft enamel-alkaline extract by anion exchange chromatography, ultrafiltration, and heparin affinity chromatography 712586 3.4.24.B6 Ni-NTA column chromatography 684397 3.4.24.B6 nickel resin chromatography 684767 3.4.24.B6 purified on Ni column 667722 3.4.24.B6 Q-Sepharose column chromatography and heparin Sepharose 6 column chromatography 719262 3.4.24.B6 recombinant from Escherichia coli 649826 3.4.24.B6 recombinant His-tagged MMP-20 by metal affinity chromatography 712587, 712590