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Phylogenetic tree based on small subunit ribosomal RNA sequences (adapted from refs. 39 and 40). The occurrence of lysS genes (10) encoding orthologues of either class I-type (indicated by 1) or class-II type (indicated by 2) LysRSs has been superimposed. The positioning of mitochondria within the bacterial lineage is after Barns et al. (39).
