Figure 1.
From: Complete genome sequence of Treponema pallidum strain DAL-1
Phylogenetic tree based on 16S rRNA of T. pallidum DAL-1 and some strains of Treponema species. The bar scale represents the number of nucleotide substitutions per 1 nt site. The tree was generated using tree-builder, which is available from the Ribosomal Database project [28], using the Weighbor (weighted neighbor-joining) algorithm [29] and the Jukes-Cantor distance correction [30]. A Spirochaeta zuelzerae type strain was used as the out-group.