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Key evolutionary steps that have shaped the current genetic organization of the rpmG2-hadA/CB locus in Actinobacteria. Except for Corynebacterineae, the different species subtrees have been collapsed for clarity. The ancestral locus organization is shown at the top right. The dating of the various evolutionary events (gene acquisition, gene deletion, and gene duplication) is indicated by an arrow pointing to the branch of the tree where they probably occurred.
