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Evolutionary distance dendogram of the β-subdivision proteobacteria nitrifiers and associated Mono Lake clones, based on 582 bp of a 16S rRNA sequence (GM5F-DS907R fragment). DNA sequences from the Mono Lake samples are identified by month and DNA sample number, as listed in Table 3. Branch points supported (bootstrap values ≥75%) by parsimony and distance analyses are indicated by solid circles.
