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Alternative “complete” corrinoids in S. enterica. The CN(β) derivatives are formed in the process of extracting corrinoids from cells. A methyl group (not shown) can also serve as a β-axial ligand and is involved in methyl transfer reactions. The corrin moiety is provided to cells as dicyanocobinamide (CN)2Cbi, which has only the aminopropanol side chain and no ligand nucleotide; in the presence of CN− ions, it has CN as both the β- and α-axial ligand.
