Gene maps of prasinococcalean chloroplast genomes. (A) Prasinococcus, (B) Prasinophyceae sp. MBIC 10622 and (C) Prasinoderma. Filled boxes represent genes, with colors denoting gene categories as indicated in the legend at the bottom the figure. Genes on the outside of each map are transcribed counterclockwise; those on the inside are transcribed clockwise. On panels A and B, thick lines in the inner rings denote the gene clusters that were found to be conserved in pair-wise comparisons of the three clade-VI genomes. In panel A, the inner rings from the inside to the outside indicate the levels of synteny between the Prasinococcus cpDNA and those of Prasinophyceae sp. and Prasinoderma, respectively, whereas the level of synteny between the latter two genomes is shown in panel B.