Figure 2.

Genome plot of recently acquired genomic islands in Synechococcus spp. BL107 and CC9902 and whole genome alignment showing the positions of orthologous genes. (a) Genome plot with predicted islands highlighted in grey, except the phycobilisome gene cluster, which is highlighted in orange. The frequency with which a gene appears among the 14 genomes analyzed is represented by an open circle (that is, a core gene is present in 14 genomes). Deviation in tetranucleotide frequency is plotted in red as the first principal component in overlapping six gene intervals relative to the mean of the entire genome (black line) and standard deviation (broken black lines). The position of tRNA genes (purple bars) and mobility genes, such as those encoding phage integrases and transposases, are also indicated (green bars). (b) Whole genome alignment of Synechococcus BL107 and CC9902 showing the positions of orthologous genes.