Fig. 2

Occurrence of ole gene clusters in the bacterial tree of life. a Species containing ole gene clusters are marked with a black circle. The phylogenetic tree is adapted from [dataset] Segata et al. [12] and contains 3530 bacterial species. For selected families, the number of ole gene-containing species out of all the species in the tree is shown (black text). Similarity network analysis of OleA protein sequences between members of the same and all other ole gene cluster-possessing phyla. b A horizontal gene transfer event is marked using a black arrow