Modelling FND. (A) Pymol representation Synechocystis PCC6803 FND modelled with the MODELLER 9v6 program. Helices and loops are represented in red and green respectively. Hydrophobic positions of Syn6803 FND conserved in the DnaD-like domain (Figure 3A and additional file 2) are shown. (B) The highly conserved G58R59Y60 [K/R]61 motif localizes in a loop between the helices 3 and 4.