Mapping of replication origin-like sequence homologues in first category of chloroplast genomes. The figures show matches of replication-origin sequences mapped on the tobacco chloroplast genome with those in other Viridiplantae chloroplast genome categories, as found using NCBI pair wise Blast tool (E = 0.0001). Chloroplast genomes have been partitioned into seven categories based on the number of homologues found to known replication origins in tobacco. The number of regions between each pair of replication origins, analyzed for the presence of deamination gradients is indicated within parentheses next to each category. Representative genomes from first category are depicted here, with the name of the genome indicated within the circular map. Several categories have more than one representative genome, owing to their overall similar number of matches but differences in the type of matches (see Methods). Genomes of plant species other than those indicated among the representative maps have been tabulated in Table 1, according to their respective fits to match categories.