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Structure of the bacterial canonical HOs. (A) Overall structural fold of the δ/β-regioselective P. aeruginosa HemO [Protein Data Bank (PDB) code 1SK7]. (B) Active site structure with the C. diphtheriae FeII–O2 heme–HmuO complex (PDB code 1V8X), where the oxygen atoms of the structural waters are represented as red balls and the bound O2 is shown in stick format.
