2.4.1.B62 - 2.4.1.B62 purification of toxin B from strain 8864 that does not produce toxin A 2.4.1.B62 recombinant C-terminally His6-tagged deletion mutants from Bacillus megaterium by nickel affinity chromatography 2.4.1.B62 recombinant His6-tagged wild-type and mutant enzymes from Bacillus megaterium by nickel affinity chromatography and gel filtration