Bacterial tree. Species tree for 43 Bacteria encoding LysRS2 and LysRS1. Mycoplasma in the figure refers to both Mycoplasma pneumoniae and Mycoplasma genitalium. Gamma-proteobacteria (5) refers to the following five species: Escherichia coli, Haemophilus influenzae, Buchnera aphidicola, Coxiella burnetii, Salmonella typhimurium. Rickettsia refers to both Rickettsia conorii a nd Rickettsia prowazekii Organisms coding for LysRS1 are colored blue, those coding for LysRS2 are in red, and the two Bacteria that code both are in purple. Arrows indicate inferred LGT events.