Fig. 7

Phylogenetic analysis of RFO proteins. The arbitrarily rooted ML tree was inferred using RAxML (PROTGAMMALG model) based on an alignment of 365 amino acid positions. Branch support values (rapid bootstraps) ≥ 51% are shown. Note the maximal support for the grouping of alphaproteobacterial and eukaryotic sequences. The black triangle represents a large cluster of alphaproteobacterial sequences that was collapsed for simplicity (the full version of the tree is provided as Additional file 7: Figure S3 (A)). Sequences included in the analysis are described in Additional file 4: Table S3 (C)