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Multiple sequence alignment of the 16S-23S rDNA ISR1 of the six California PDD-associated Treponema isolates and the related human-associated Treponema spp. The 3′ end of the 16S rDNA, the tRNAAla gene, and the 5′ end of the 23S rDNA are indicated. Abbreviations: Tmed, T. medium; Tvin, T. vincentii; Tpha, T. phagedenis; Tden, T. denticola.
