... Structural and functional analysis of the riboflavin synthesis genes encoding GTP cyclohydrolase II (ribA), DHBP synthase (ribBA), riboflavin synthase (ribC), and riboflavin deaminase/reductase (ribD) ... Downstream of ribX, four rib genes ) ribD, ribC, ribBA and ribE ) were organized in a complete operon in the same arrangement as the complete rib operons in other species The tail of ribD overlapped ... Homologies of five rib proteins, RibX, RibD, RibC, RibBA and RibE of P phosphoreum or V fischeri with those of seven species Amino acid identity (%) in the sequences of five Rib proteins of P phosphoreum...