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Haem chains in tetra-haem cytochromes from S. oneidensis. (a) The quinol oxidase CymA (haem chain from the homologous NrfH from D. vulgaris shown in lieu of resolved structure for CymA). (b) The periplasmic electron shuttle STC. (c) The fumarate reductase FccA, also including the FAD cofactor (cyan). PDB codes as for figure 3.
