>sp|Q9UZ37|RIBL_PYRAB FAD synthase OS=Pyrococcus abyssi GN=ribL MAGNRRIRVVVGGVFDILHVGHIHFLKMAKELGDELIVIVAHDETVKKRKGRPPINPAED RAEVLRAIRYVDDVVIGEPGEISLELIKKLKPDVIALGPDQDFDCRTLKEKLRSIGLKVE VIRLPYLYKEDRAKTSKIIKRITEIFCD