<p><b>Copyright information:</b></p><p>Taken from "The ancestor of the chromatophore obtained a carboxysomal operon by horizontal gene transfer from a -like γ-proteobacterium"</p><p>http://www.biomedcentral.com/1471-2148/7/85</p><p>BMC Evolutionary Biology 2007;7():85-85.</p><p>Published online 5 Jun 2007</p><p>PMCID:PMC1904183.</p><p></p> represent synapomorphies of α-cyanobacterial clades to the exclusion of and other prokaryotes. Sequence data and evolutionary changes are plotted on a simplified phylogram (NJ-bootstrap consensus tree). Pair 868/909 shows a uniquely derived CBC (compensatory base change: U-A → C-G) of all free-living α-cyanobacteria; the neighbouring pair 869/908 changed in the common ancestor of the marine PS-subclades (marine and ) whereas the -clade and are plesiomorphic. Pair 869/908 shows parallel changes in a few other cyanobacteria, (e.g. in )
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