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. 2023 Jan 4;145(2):960–966. doi: 10.1021/jacs.2c10080

Figure 1.

Figure 1

Cobalamin transport system in E. coli. BtuB–CNCbl–TonBΔTMD (PDB 2GSK), ExbB–ExbD (PDB 6TYI), BtuF–CNCbl (PDB 1N4A), and BtuCD–BtuF (PDB 2QI9) structures are shown.