Figure 2

Conservation of gene pairs in Oedogonium and other UTC algal cpDNAs. For each gene pair, adjoining termini of the genes are indicated. Filled boxes indicate the presence of gene pairs with the same relative polarities in two or more genomes. Grey or open boxes indicate the absence of gene pairs. A grey box indicates that the two genes associated with a gene pair are found in the genome but are unlinked. An open box indicates that one or both genes associated with a gene pair are absent from the genome. Two horizontal lines at the bottom of the figure denote the gene pairs that are shared specifically by Chlamydomonas and Scenedesmus (CS clade) and by Oedogonium and Stigeoclonium (OCC clade). The gene pairs shared by the prasinophycean Nephroselmis and the streptophyte Mesostigma viride were presumably present in the last common ancestor of all green algae. Chlorella vulgaris belongs to the Trebouxiophyceae, whereas Oltmannsiellopsis and Pseudendoclonium are representatives of the Ulvophyceae.