Phylogenetic relationships of marine Synechococcus and Prochlorococcus. (a) Unrooted distance tree based on concatenated alignments of 1,129 core proteins (307,756 amino acid positions) excluding families with paralogs. (b) 16S rRNA gene phylogeny constructed with NJ. Numbers at nodes indicate bootstrap values for distance, parsimony and ML trees, respectively.
Dufresne et al. Genome Biology 2008 9:R90 doi:10.1186/gb-2008-9-5-r90