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Anaerobic biosynthesis of the lower ligand of cobalamin. (a) Structure of cobalamin. DMB lower ligand is highlighted in blue, the upper ligand in red. (b) The DMB biosynthetic pathway identified in E. limosum. (c) Results of isotope labeling experiments for DaBzaF. (d) Comparison of the proposed mechanisms for ThiC and BzaF.
