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The structure of E. coli NrfA. Hemes are numbered according to their order of attachment to the protein sequence. Perspectives A and C are related to B by 90° rotation around the y and x axes, respectively. The dashed curves in B indicate the region proposed to dock to the physiological redox partner NrfB. The block arrows in C indicate the proposed directionality of nitrite entry to, and ammonium egress from, the active site.
