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The dissimilatory metal reduction (DMR) pathway in Shewanella oneidensis. A network of multi-heme cytochromes is responsible for the long-range electron transfer from the quinol pool through the tetraheme cytochrome, CymA, across the periplasm via MtrA, and finally to MtrC through the porin protein, MtrB. Arrows indicate substantiated redox reactions through electrochemical and spectroscopic studies (see main text).
