Fig 2.

Phylogenetic relationships among sequenced strains of Geobacillus inferred from a multiple sequence alignment of recN sequences. The circles indicate strains whose genomes have been sequenced, as listed in Table 1. The triangles indicate type strains of the various Geobacillus species; recN sequences from these are taken from a previous phylogenetic analysis by Zeigler (2005). The maximum-likelihood tree was generated using mega6 (Tamura et al., 2013).