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Proposed metabolic functions of CpI and CpII in C. pasteurianum. CpI acts as an electron sink under standard fermentative conditions, while CpII acts to recycle reducing equivalents in H2 during nitrogen fixation. It should be noted that the [NiFe]-hydrogenase may also function alongside CpII to recycle reducing equivalents, although this hydrogenase probably makes a smaller contribution than CpII to H2 oxidation.
