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Phylogenetic comparison 16S rRNA gene sequences from L. pneumophila reference strains and from the environmental phylotype PTL-02, the PTL most similar to L. pneumophila. The phylotype is represented by five sample-specific sequences, designated PTL-02.1 to -02.5, obtained from cold (filled circles) and hot (open circles) drinking water. Scale bar indicates the base substitutions for each position.
