Fig. 4.

Phylogenetic tree combined with the distribution of antibiotic-resistance genes. Black rectangles indicate resistance genes found in the chromosome, green rectangles represent plasmid-associated genes with symbols indicating different plasmids, and purple rectangles show genes found both in the chromosome and the plasmid in USA15. Antibiotic-resistance genes predicted to be in AbaR and AbGRI3 are separated and shown as two different blocks. The black lines, linking green/purple rectangles, indicate genes found on the same plasmid.