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Crystal structure of YtfE. (a) Annotated structure of C30A/C31A YtfE (PDB: 5FNN). Hydrophilic (pink) and hydrophobic (yellow) channels leading to the di-iron center are shown. (b) Detailed view of the di-iron center. Molecular graphic images were made with USCF Chimera.34 Channels were calculated with Mole 2.0.26,35
