Cytochrome c550 QEGDAAKGEKEFNKCKACHMVQAPDGTDIVKGGKTGPNLYGVVGRKIASEEGFKYGDGILEVAEKNPDLVWTEADLIEYVTDPKPWLVEKTGDSAAKTKMTFKLGKNQADVVAFLAQNSPDAGAEAAPAEDAAD Cytochrome c-550 Electron donor for nitrous-oxide reductase. 134 CY550_PARPN