BuchneraAphidsSymbiosisGenome, BacterialAnthranilate SynthaseSequence Analysis, DNAGenes, BacterialSerratiaEvolution, MolecularLuteovirusSpecies SpecificityDNA, BacterialGammaproteobacteriaPhylogenyEscherichia coliRNA, Ribosomal, 16SMolecular Sequence DataChaperonin 60Amino Acids, EssentialGenome SizeDNA, Ribosomal