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Overall structures of bd-type oxidases from E. coli ([35], PDB ID: 6RX4), M. smegmatis ([81], PDB ID: 7D5I), and G. thermodenitrificans K1041 ([33], PDB ID: 5DOQ). The three hemes in all structures are in a triangular arrangement but positions of heme b595 and heme d in the enzymes from E. coli and M. smegmatis are interchanged as compared to those in the G. thermodenitrificans oxidase. The figure was carried out using Visual Molecular Dynamics software (v1.9.3) [32].
