Fig. 2

Arsenic resistance and metabolism genes in RefSoil+ organisms. a Maximum likelihood tree of 16S rRNA genes in RefSoil+ organisms. Bootstrap support > 50 is shown with black circles. Tree branches and the first ring are colored by organism taxonomy. Each node is annotated with arsenic resistance genotype where color indicates the gene. Filled boxes indicate gene presence on chromosome, and open boxes indicate gene presence on plasmid. b Proportion of RefSoil+ organisms and organisms containing arsenic resistance genes are colored by the taxonomy of the organism containing the gene. “None” refers to the number of genomes that do not test positive for any of the nine arsenic resistance genes analyzed. Note the difference between y-axes