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Proposed model of membrane-bound electron transfer in M. mazei. Proton translocation has been shown for the heterodisulfide reductase (14) and F420H2 dehydrogenase (2). Proton translocation for the Ech hydrogenase is assumed. H2ase, hydrogenase; DH, dehydrogenase; HDR, heterodisulfide reductase; MPhen, methanophenazine.
