Distribution of cyanobacterial sequences. An alignment of sequences of TonB-dependent transporters listed in Table 1 was used to reconstruct a maximum likelihood phylogeny. Bootstrap values were calculated from 1000 phylogenetic trees. To indicate the probability of occurrence of an edge in these trees the edges are shown in shades of grey.
Mirus et al. BMC Biology 2009 7:68 doi:10.1186/1741-7007-7-68