Figure 4

Maximum likelihood phylogenetic tree based on the amino acid sequences of Wolbachia secA gene wBol1_1092 and its homologs. Prokaryote and eukaryote secA genes cluster into two separate, well-supported clades. There are two apparent transfers from eukaryote to prokaryote species, marked with arrowheads. Bootstrap values over 50 are shown; for clarity they have been removed from short internal branches within the prokaryote clade and the large Daphnia and Harpegnathos clades. Each tip is labelled with the sequence’s Genbank GI number and the species name.