Figure 5.

Neighbor joining tree of the ampC genes in Citrobacter, Escherichia, Enterobacter and Shigella species.

The phylogenetic tree of ampC genes in Citrobacter, Escherichia, Enterobacter and Shigella species was created with the Ridom SeqSphere+ software v4.1.9 using a neighbor joining algorithm. The scale bar represents the % difference among 77 nucleotides of ampC, using the ampC gene of the E. coli K12 strain MG1655 as a reference. Bacterial isolates and the respective genome sequence accession codes are presented in Supplemental Table S2.