Fig. 4

Circular maps of the s4 genome generated by using DNAPlotter. A The chromosome of s4; B The plasmid of s4. From the outside to the inside, circle 1 (black): DNA base position; circle 2 (cyan-blue): protein-coding regions in forward strand; circle 3 (cyan-blue): protein-coding regions in reverse strand; circle 4 (red): tRNA genes; circle 5 (blue): rRNA genes; circle 6 (green): genomic islands; circle 7 (purple): prophages; the two innermost circles represent the G + C content and GC skew, respectively