Figure 4

Genome quartet of Synechocystis sp., Chlorobium tepidum , Rhodobacter capsulatus and Rhodopseudomonas palustris . A) Posterior probability map calculated using probability mapping as described in [4, 17]. B) Bootstrap support map (see [4] for methodology of bootstrap support map reconstruction). Only the four putatively orthologous sequences were utilized in the analyses. C) Bootstrap support map from extended datasets. For details on the figure notations see legends for figures 1 and 3. The majority of QuartOPs support one tree topology grouping two alpha proteobacteria together. The QuartOPs located in the two other corners of the triangle are candidates for horizontal gene transfer.