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Gene families gained per branch in Roseobacter versus SAR11 lineages (left) and in Roseobacter ancestral nodes R37 versus R1 to R36 (right). Letters represent COG categories. Asterisks indicate significant differences in proportions based on Xipe analysis (64) (P < 0.01). The horizontal axis indicates the number of families gained per branch for each COG class. Cell motility families gained in SAR11 represent pilus formation genes.
