Phylogenetic tree inferred from completely sequenced genomes of the Spirochaeta type strains. The tree was inferred from 140,413 aligned amino acid characters under the maximum likelihood (ML) criterion and rooted with Leptospira. The branches are scaled in terms of the expected number of substitutions per site. Numbers above the branches are bootstrapping support values (if larger than 60%) from (i) maximum-likelihood supermatrix analysis; (ii) maximum-parsimony supermatrix analysis; (iii) maximum-likelihood gene-content analysis; (iv) maximum-parsimony gene-content analysis. INSDC accession numbers are given in square brackets. Note that the placement of Borrelia is probably caused by long-branch attraction. For further details see the text.