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Secondary (gammaproteobacterial) endosymbiont 16S ribosomal sequence phylogenetic tree. All sequences, except three free-living gammaproteobacterial species, are those of the 16S RNA genes from gammaproteobacterial symbionts of the named insect species. Known primary endosymbionts have “P” suffixed. The 16S ribosomal sequence from the free-living gammaproteobacterium E. coli W3110 (NCBI accession no. AP009048, annotated Ecol) was used as the outgroup.
