a. Identification of the Fur box. Upstream sequences were analysed for Fur box based on consensus sequence derived from E. coli. Two Fur boxes were located upstream of lep irmp (LB191) as shown and b. shows the neighbourhood genes of lep irmp. Most of them are yet to be identified and are assigned as hypothetical; LB183 is the furgene and LB186 is heme oxygenase.