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Proposed branched electron transport chain of L. plantarum WCFS1 that terminates in either a nitrate reductase A or a bd-type cytochrome complex. The dashed arrows represent the extracellular origin of menaquinone (vitamin K2) and heme. Red. sub., reduced substrate; Oxid. sub., oxidized substrate; mQ, menaquinone; mQH2, menaquinol.
