3.4.21.B30 - 651420, 651629, 651685, 652782, 653235, 653588, 653602, 653917, 668384 3.4.21.B30 His-tag fusion protein, Ni-affinity chromatography 669529 3.4.21.B30 homogeneity, wild-type and mutants 651622 3.4.21.B30 Ni2+-NTA affinity resin column chromatography 681885 3.4.21.B30 Superdex 75 gel filtration 682581