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Molecular phylogenetic analysis of the β-endosymbionts of mealybugs and allied betaproteobacteria on the basis of 16S rRNA gene sequences. A maximum likelihood tree inferred from 1,250 unambiguously aligned nucleotide sites is shown, whereas a neighbor-joining tree exhibited essentially the same topology (data not shown). Bootstrap values of >50% are shown at the nodes. Accession numbers are shown in brackets.
