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Diagram showing a putative pathway of electron transfer based on genetic components present in H. modesticaldum. Cyclic electron transfer has not been confirmed in heliobacteria. In addition, the reduction of NAD+ by cytoplasmic ferredoxin has not been confirmed, as a gene encoding FNR was not identified in the genome. Despite this, genes encoding all 14 subunits of NADH:quinone oxidoreductase (nuoA to nuoN) were putatively identified.
