>tr|M9YEI9|M9YEI9_AZOVI 4Fe-4S ferredoxin OS=Azotobacter vinelandii CA6 GN=AvCA6_03470 MSLKITDDCINCDVCEPECPNGAISQGEEIYVIDSNLCTECVGHYDEPQCQQVCPVDCIP HDENRVESREELMRKYLIITGKA