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The BtuB T156R1 crystal structure superposed on the wild-type coordinates (PDB ID: 1NQE). T156R1 nearest-neighbor residues from the spin-labeled structure are rendered as sticks and shown in gray, whereas the same residues from the wild-type structure are shown in green. The Q158, L160 and L168 rotamers are altered upon introduction of R1 at residue 156.
