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Phylogenetic tree based on partial betaproteobacterial 16S rDNA sequences (≥800 bp) of AOB enrichment cultures inferred by maximum likelihood analysis. The scale bar represents 10% nucleotide sequence difference. Symbols on the branches indicate bootstrap confidence values as follows: filled circle >80%, filled square 60–80%, open triangle 40–60%. Nitrosococcus halophilus (AF287298) was used as outgroup. Nc. mobilisNitrosococcus mobilis
