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The neighbor-joining tree was calculated from concatenated sequences of 246 globally representative H. pylori strains downloaded from MLST website (Http://pubmlst.org/Helicobacter) plus the 46 isolates studied here. Strains were colour-coded by population as follows: blue, hpAfrica1; light green, hpNEAfrica; dark green, hpEurope; grey, hpAsia2; purple, hpSahul; olive, hpEastAsia; red, hpAfrica2.
