>sp|Q8U1T9|RIBL_PYRFU FAD synthase OS=Pyrococcus furiosus GN=ribL MGDNRKVRVVVGGVFDILHVGHVHFLKMAKELGDELIVIVAHDETVKRRKGRPPINPAED RAELLKSIRYVDDVVIGEPGEISIDLIKRLKPDVIALGPDQDFSCEELKKRLRKEGINAE VIRLPYLYKSDRAKTSKIIQRIIETFCE