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Neighbor-joining phylogenetic trees of 16S rRNA gene sequences (∼460 bp) obtained from clones (lowercase letters) or isolates (uppercase letters) of Actinobacteria (A), Verrucomicrobia and Planctomyces (B), and Betaproteobacteria (C). Sequences with the prefix dil originate from dilution culture isolates. The environment of origin is given for reference sequences if information was available in GenBank.
