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Superimposed structures of NrfH (black) from D.vulgaris (PDB entry 2J7A) and cyt cm552 model (red) coordinates: (A) main chain peptide backbone, (B) hemes 1–4, (C) heme 4 showing the potential distal His ligand to cyt cm552, and (D) putative Q-binding pocket in cyt cm552 according to molecular modeling.
