Dendrograms of Arcobacter atpA and glyA alleles. A: atpA; B: glyA. The dendrograms were constructed using the neighbor-joining algorithm and the Kimura two-parameter distance estimation method. The scale bars represent substitutions per site. The A. halophilus strain LA31B atpA and glyA sequences were extracted from the draft A. halophilus genome. Note the presence of a putative laterally-transferred allele within the A. thereius glyA cluster.