Figure 8.
Distribution of hemH genes coding for FeCh with and without the CAB domain in an evolutionary tree of cyanobacteria. FeCH lacking the CAB domain is plesiomorphic in cyanobacteria. The fusion of FeCH and CAB may have occurred twice (the orange clade and the black clade) or may have been lost once (sister clade to the orange one) after duplication of hemH. The tree inferred from 22 conserved proteins in 220 genomes was calculated using Bayesian inference posterior probabilities are shown near the nodes. Numbers in brackets indicate the number of genomes in a collapsed clade or possessing a particular organization of FeCH-coding genes as explained in the legend.