Phylogenetic analysis of confirmed/putative HtrB and MsbB of L. hongkongensis , C. violaceum , N. meningitidis and N. gonorrhoeae. The tree was constructed by neighbor joining method using Kimura's correction and was rooted using HtrB of Rickettsia typhi (YP_067645). Two hundred and eighty-four amino acid positions were included in the analysis. The scale bar indicates the estimated number of substitutions per 20 amino acids. Numbers at nodes indicated levels of bootstrap support calculated from 1000 trees. All names and accession numbers are given as cited in the GenBank database.