Fig. 6

ICEs core-gene conservation and evolutionary history. a Plot of eight core genes found in ICEs dataset with the number of components of T4SS grouped by species. Blue colored square indicates the presence of the gene in the element and the colorless square indicates the absence. Abbreviation for Rec, Recombinase; T4CP, type-IV coupling proteins; topo III, topoisomerase III; Single-strand DNA-binding protein (SSB). b Maximum Likelihood tree based on the eight backbone gene alignments. The General Time Reversible model and a bootstrap confidence value of 1,000 were applied to the tree. The alignment and phylogenetic analysis were done using MEGA X. The tree is drawn to scale, with branch lengths measured in the number of substitutions per site