>sp|Q31C72|UCRI_PROM9 Cytochrome b6-f complex iron-sulfur subunit OS=Prochlorococcus marinus GN=petC MTQLSSNDVPSMGRRQFMNLLTFGTATGVALGALYPVANYFMPLRAGGGGGGTSAKDELG NPVTKTGWLATHQAGDRSLVQGLKGDPTYLIVNEGGEIGEFGLNAICTHLGCVVPWDSGA NKFICPCHGSQYDTNGKVVRGPAPLSLALAHVDIEDDAVLVKQWSETDFRTNENPWWA