Fig. 5

Phylogeny of Cluster II Frankia strains based on glnA. All DNA sequences used in this figure are referenced in Additional file 6. Acidothermus cellulolyticus [93] and several Cluster I and Cluster III strains were used as outgroups. Sequences were taken from Vanden Heuvel et al. [21], Clawson et al. [33] and Nouioui et al. [27] and from the three Cluster II genomes available; sequences of 34 field samples were contributed by this study (see Additional file 6)