2.1.1.248	native enzyme, separation from co-purifiying MtmC, the methylamine-specific corrinoid protein, by gel filtration	
2.1.1.248	native MtmB from monomethylamine-grown cells, by two different steps of anionexchange chromatography, followed by gel filtration and another step of anion exchange chromatography to near homogeneity	
2.1.1.248	native MtmB from monomethylamine-grown cells, by two different steps of anionexchange chromatography, followed by gel filtration and another step of anion exchange chromatography to near homogeneity, co-purification with the monomethylamine-specific corrinoid protein MtmC