Figure 1From: Comparative genomics of prevaccination and modern Bordetella pertussis strainsPhylogenetic tree of strains used in this study based on 471 SNPs. Colored strain designations indicate ptxP alleles: black, ptxP1; blue, ptxP2; red, ptxP3. The location of the root was based on the sequence of B. bronchiseptica RB50 strain [6].Back to article page