Phylogenetic tree of Helicobacter pylori pldA sequences. The pldA sequences were biogeographically classified: blue represents European strains, orange indicates hpEastAsian isolates, and green denotes African strains (hpAfrica). The outliers are identified by black arrows (see Discussion for more information).Additional file 1: Table S2 contain label with corresponding GenBank Accession ID. Shown are radial consensus trees of 246 pldA sequences based on 1000 maximum likelihood bootstrap replicates analyzed in PhyML and visualized in FigTree (see Methods for details). Trees were constructed using either the K80 + G + I model chosen by ModelTest (A) or the GTR + I + G model (B) as used to construct the reference tree (Figure1).